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A caste is a fixed social group into which an individual is born within a particular system of social stratification: a caste system. Within such a system, individuals are expected to: marry exclusively within the same caste (endogamy), follow lifestyles often linked to a particular occupation, hold a ritual status observed within a hierarchy, and interact with others based on cultural notions of exclusion, with certain castes considered as either more pure or more polluted than others. Its paradigmatic ethnographic example is the division of India's Hindu society into rigid social groups. Its roots lie in south Asia's ancient history and it still exists. However, the economic significance of the caste system in India has been declining as a result of urbanisation and affirmative action programs. A subject of much scholarship by sociologists and anthropologists, the Hindu caste system is sometimes used as an analogical basis for the study of caste-like social divisions existing outside Hinduism and India. The term "caste" is also applied to morphological groupings in eusocial insects such as ants, bees, and termites.
The English word caste (/kɑːst, kæst/) derives from the Spanish and Portuguese casta, which, according to the John Minsheu's Spanish dictionary (1569), means "race, lineage, tribe or breed". When the Spanish colonised the New World, they used the word to mean a 'clan or lineage'. It was, however, the Portuguese who first employed casta in the primary modern sense of the English word 'caste' when they applied it to the thousands of endogamous, hereditary Indian social groups they encountered upon their arrival in India in 1498. The use of the spelling caste, with this latter meaning, is first attested in English in 1613. In the Latin American context, the term caste is sometimes used to describe the casta system of racial classification, based on whether a person was of pure European, Indigenous or African descent, or some mix thereof, with the different groups being placed in a racial hierarchy; however, despite the etymological connection between the Latin American casta system and South Asian caste systems (the former giving its name to the latter), it is controversial to what extent the two phenomena are really comparable.
In South Asia
Modern India's caste system is based on the artificial modern superimposition of an old four-fold theoretical classification called the Varna on the natural social groupings called the Jāti. Varna conceptualised a society as consisting of four types of varnas, or categories: Brahmin, Kshatriya, Vaishya and Shudra, according to the nature of the work of its members. Varna was not an inherited category and the occupation determined the varna. However, a person's Jati is determined at birth and makes them take up that Jati's occupation; members could and did change their occupation based on personal strengths as well as economic, social and political factors. A 2016 study based on the DNA analysis of unrelated Indians determined that endogamous Jatis originated during the Gupta Empire.
From 1901 onwards, for the purposes of the Decennial Census, the British colonial authorities arbitrarily and incorrectly forced all Jātis into the four Varna categories as described in ancient texts. Herbert Hope Risley, the Census Commissioner, noted that "The principle suggested as a basis was that of classification by social precedence as recognized by native public opinion at the present day, and manifesting itself in the facts that particular castes are supposed to be the modern representatives of one or other of the castes of the theoretical Indian system."
Varna, as mentioned in ancient Hindu texts, describes society as divided into four categories: Brahmins (scholars and yajna priests), Kshatriyas (rulers and warriors), Vaishyas (farmers, merchants and artisans) and Shudras (workmen/service providers). The texts do not mention any hierarchy or a separate, untouchable category in Varna classifications. Scholars believe that the Varnas system was never truly operational in society and there is no evidence of it ever being a reality in Indian history. The practical division of the society had always been in terms of Jatis (birth groups), which are not based on any specific religious principle, but could vary from ethnic origins to occupations to geographic areas. The Jātis have been endogamous social groups without any fixed hierarchy but subject to vague notions of rank articulated over time based on lifestyle and social, political or economic status. Many of India's major empires and dynasties like the Mauryas, Shalivahanas, Chalukyas, Kakatiyas among many others, were founded by people who would have been classified as Shudras, under the Varnas system, as interpreted by the British rulers. It is well established that by the 9th century, kings from all the four Varnas, including Brahmins and Vaishyas, had occupied the highest seat in the monarchical system in Hindu India, contrary to the Varna theory. In many instances, as in Bengal, historically the kings and rulers had been called upon, when required, to mediate on the ranks of Jātis, which might number in thousands all over the subcontinent and vary by region. In practice, the jātis may or may not fit into the Varna classes and many prominent Jatis, for example the Jats and Yadavs, straddled two Varnas i.e. Kshatriyas and Vaishyas, and the Varna status of Jātis itself was subject to articulation over time. 
Starting with the 1901 Census of India led by colonial administrator Herbert Hope Risley, all the jātis were grouped under the theoretical varnas categories. According to political scientist Lloyd Rudolph, Risley believed that varna, however ancient, could be applied to all the modern castes found in India, and "[he] meant to identify and place several hundred million Indians within it." The terms varna (conceptual classification based on occupation) and jāti (groups) are two distinct concepts: while varna is a theoretical four-part division, jāti (community) refers to the thousands of actual endogamous social groups prevalent across the subcontinent. The classical authors scarcely speak of anything other than the varnas, as it provided a convenient shorthand; but a problem arises when colonial Indologists sometimes confuse the two.
Upon independence from Britain, the Indian Constitution listed 1,108 Jatis across the country as Scheduled Castes in 1950, for positive discrimination. This constitution would also ban discrimination of the basis of the caste, though its practice in India remained intact. The Untouchable communities are sometimes called Scheduled Castes, Dalit or Harijan in contemporary literature. In 2001, Dalits were 16.2% of India's population. Most of the 15 million bonded child workers are from the lowest castes. Independent India has witnessed caste-related violence. In 2005, government recorded approximately 110,000 cases of reported violent acts, including rape and murder, against Dalits. For 2012, the government recorded 651 murders, 3,855 injuries, 1,576 rapes, 490 kidnappings, and 214 cases of arson.
The socio-economic limitations of the caste system are reduced due to urbanisation and affirmative action. Nevertheless, the caste system still exists in endogamy and patrimony, and thrives in the politics of democracy, where caste provides ready made constituencies to politicians. The globalisation and economic opportunities from foreign businesses has influenced the growth of India's middle-class population. Some members of the Chhattisgarh Potter Caste Community (CPCC) are middle-class urban professionals and no longer potters unlike the remaining majority of traditional rural potter members. There is persistence of caste in Indian politics. Caste associations have evolved into caste-based political parties. Political parties and the state perceive caste as an important factor for mobilisation of people and policy development.
Studies by Bhatt and Beteille have shown changes in status, openness, mobility in the social aspects of Indian society. As a result of modern socio-economic changes in the country, India is experiencing significant changes in the dynamics and the economics of its social sphere. While arranged marriages are still the most common practice in India, the internet has provided a network for younger Indians to take control of their relationships through the use of dating apps. This remains isolated to informal terms, as marriage is not often achieved through the use of these apps. Hypergamy is still a common practice in India and Hindu culture. Men are expected to marry within their caste, or one below, with no social repercussions. If a woman marries into a higher caste, then her children will take the status of their father. If she marries down, her family is reduced to the social status of their son in law. In this case, the women are bearers of the egalitarian principle of the marriage. There would be no benefit in marrying a higher caste if the terms of the marriage did not imply equality. However, men are systematically shielded from the negative implications of the agreement.
Geographical factors also determine adherence to the caste system. Many Northern villages are more likely to participate in exogamous marriage, due to a lack of eligible suitors within the same caste. Women in North India have been found to be less likely to leave or divorce their husbands since they are of a relatively lower caste system, and have higher restrictions on their freedoms. On the other hand, Pahari women, of the northern mountains, have much more freedom to leave their husbands without stigma. This often leads to better husbandry as his actions are not protected by social expectations.
Chiefly among the factors influencing the rise of exogamy is the rapid urbanisation in India experienced over the last century. It is well known that urban centers tend to be less reliant on agriculture and are more progressive as a whole. As India's cities boomed in population, the job market grew to keep pace. Prosperity and stability were now more easily attained by an individual, and the anxiety to marry quickly and effectively was reduced. Thus, younger, more progressive generations of urban Indians are less likely than ever to participate in the antiquated system of arranged endogamy.
India has also implemented a form of Affirmative Action, locally known as "reservation groups". Quota system jobs, as well as placements in publicly funded colleges, hold spots for the 8% of India's minority, and underprivileged groups. As a result, in states such as Tamil Nadu or those in the north-east, where underprivileged populations predominate, over 80% of government jobs are set aside in quotas. In education, colleges lower the marks necessary for the Dalits to enter.
The Nepali caste system resembles in some respects the Indian jāti system, with numerous jāti divisions with a varna system superimposed. Inscriptions attest the beginnings of a caste system during the Licchavi period. Jayasthiti Malla (1382–1395) categorised Newars into 64 castes (Gellner 2001). A similar exercise was made during the reign of Mahindra Malla (1506–1575). The Hindu social code was later set up in the Gorkha Kingdom by Ram Shah (1603–1636).
McKim Marriott claims a social stratification that is hierarchical, closed, endogamous and hereditary is widely prevalent, particularly in western parts of Pakistan. Frederik Barth in his review of this system of social stratification in Pakistan suggested that these are castes.
The caste system in Sri Lanka is a division of society into strata, influenced by the textbook varnas and jāti system found in India. Ancient Sri Lankan texts such as the Pujavaliya, Sadharmaratnavaliya and Yogaratnakaraya and inscriptional evidence show that the above hierarchy prevailed throughout the feudal period. The repetition of the same caste hierarchy even as recently as the 18th century, in the Kandyan-period Kadayimpoth – Boundary books as well indicates the continuation of the tradition right up to the end of Sri Lanka's monarchy.
Outside South Asia
Balinese caste structure has been described as being based either on three categories—the noble triwangsa (thrice born), the middle class of dwijāti (twice born), and the lower class of ekajāti (once born)--or on four castes
The Brahmana caste was further subdivided by Dutch ethnographers into two: Siwa and Buda. The Siwa caste was subdivided into five: Kemenuh, Keniten, Mas, Manuba and Petapan. This classification was to accommodate the observed marriage between higher-caste Brahmana men with lower-caste women. The other castes were similarly further sub-classified by 19th-century and early-20th-century ethnographers based on numerous criteria ranging from profession, endogamy or exogamy or polygamy, and a host of other factors in a manner similar to castas in Spanish colonies such as Mexico, and caste system studies in British colonies such as India.
In the Philippines, pre-colonial societies do not have a single social structure. The class structures can be roughly categorised into four types:
- Classless societies – egalitarian societies with no class structure. Examples include the Mangyan and the Kalanguya peoples.
- Warrior societies – societies where a distinct warrior class exists, and whose membership depends on martial prowess. Examples include the Mandaya, Bagobo, Tagakaulo, and B'laan peoples who had warriors called the bagani or magani. Similarly, in the Cordillera highlands of Luzon, the Isneg and Kalinga peoples refer to their warriors as mengal or maingal. This society is typical for head-hunting ethnic groups or ethnic groups which had seasonal raids (mangayaw) into enemy territory.
- Petty plutocracies – societies which have a wealthy class based on property and the hosting of periodic prestige feasts. In some groups, it was an actual caste whose members had specialised leadership roles, married only within the same caste, and wore specialised clothing. These include the kadangyan of the Ifugao, Bontoc, and Kankanaey peoples, as well as the baknang of the Ibaloi people. In others, though wealth may give one prestige and leadership qualifications, it was not a caste per se.
- Principalities – societies with an actual ruling class and caste systems determined by birthright. Most of these societies are either Indianized or Islamized to a degree. They include the larger coastal ethnic groups like the Tagalog, Kapampangan, Visayan, and Moro societies. Most of them were usually divided into four to five caste systems with different names under different ethnic groups that roughly correspond to each other. The system was more or less feudalistic, with the datu ultimately having control of all the lands of the community. The land is subdivided among the enfranchised classes, the sakop or sa-op (vassals, lit. "those under the power of another"). The castes were hereditary, though they were not rigid. They were more accurately a reflection of the interpersonal political relationships, a person is always the follower of another. People can move up the caste system by marriage, by wealth, or by doing something extraordinary; and conversely they can be demoted, usually as criminal punishment or as a result of debt. Shamans are the exception, as they are either volunteers, chosen by the ranking shamans, or born into the role by innate propensity for it. They are enumerated below from the highest rank to the lowest:
- Royalty – (Visayan: kadatoan) the datu and immediate descendants. They are often further categorised according to purity of lineage. The power of the datu is dependent on the willingness of their followers to render him respect and obedience. Most roles of the datu were judicial and military. In case of an unfit datu, support may be withdrawn by his followers. Datu were almost always male, though in some ethnic groups like the Banwaon people, the female shaman (babaiyon) co-rules as the female counterpart of the datu.
- Nobility – (Visayan: tumao; Tagalog: maginoo; Kapampangan ginu; Tausug: bangsa mataas) the ruling class, either inclusive of or exclusive of the royal family. Most are descendants of the royal line or gained their status through wealth or bravery in battle. They owned lands and subjects, from whom they collected taxes.
- Shamans – (Visayan: babaylan; Tagalog: katalonan) the spirit mediums, usually female or feminised men. While they were not technically a caste, they commanded the same respect and status as nobility.
- Warriors – (Visayan: timawa; Tagalog: maharlika) the martial class. They could own land and subjects like the higher ranks, but were required to fight for the datu in times of war. In some Filipino ethnic groups, they were often tattooed extensively to record feats in battle and as protection against harm. They were sometimes further subdivided into different classes, depending on their relationship with the datu. They traditionally went on seasonal raids on enemy settlements.
- Commoners and slaves – (Visayan, Maguindanao: ulipon; Tagalog: alipin; Tausug: kiapangdilihan; Maranao: kakatamokan) – the lowest class composed of the rest of the community who were not part of the enfranchised classes. They were further subdivided into the commoner class who had their own houses, the servants who lived in the houses of others, and the slaves who were usually captives from raids, criminals, or debtors. Most members of this class were equivalent to the European serf class, who paid taxes and can be conscripted to communal tasks, but were more or less free to do as they please.
China and Mongolia
During the period of Yuan Dynasty, ruler Kublai Khan enforced a Four Class System, which was a legal caste system. The order of four classes of people in descending order were:
- Semu people
- Han people (in the northern areas of China)
- Southerners (people of the former Southern Song dynasty)
Today, the Hukou system is argued by various Western sources to be the current caste system of China.[15 years ago (May 2023)">needs update]
There is significant controversy over the social classes of Tibet, especially with regards to the serfdom in Tibet controversy.
Heidi Fjeld [no] has put forth the argument that pre-1950s Tibetan society was functionally a caste system, in contrast to previous scholars who defined the Tibetan social class system as similar to European feudal serfdom, as well as non-scholarly western accounts which seek to romanticise a supposedly 'egalitarian' ancient Tibetan society.
In Japan's history, social strata based on inherited position rather than personal merit, were rigid and highly formalised in a system called mibunsei (身分制). At the top were the Emperor and Court nobles (kuge), together with the Shōgun and daimyō. Below them, the population was divided into four classes: samurai, peasants, craftsmen and merchants. Only samurai were allowed to bear arms. A samurai had a right to kill any peasants, craftsman or merchant who he felt were disrespectful. Merchants were the lowest caste because they did not produce any products. The castes were further sub-divided; for example, peasants were labelled as furiuri, tanagari, mizunomi-byakusho among others. As in Europe, the castes and sub-classes were of the same race, religion and culture.
Howell, in his review of Japanese society notes that if a Western power had colonised Japan in the 19th century, they would have discovered and imposed a rigid four-caste hierarchy in Japan.
De Vos and Wagatsuma observe that Japanese society had a systematic and extensive caste system. They discuss how alleged caste impurity and alleged racial inferiority, concepts often assumed to be different, are superficial terms, and are due to identical inner psychological processes, which expressed themselves in Japan and elsewhere.
Endogamy was common because marriage across caste lines was socially unacceptable.
Japan had its own untouchable caste, shunned and ostracised, historically referred to by the insulting term eta, now called burakumin. While modern law has officially abolished the class hierarchy, there are reports of discrimination against the buraku or burakumin underclasses. The burakumin are regarded as "ostracised". The burakumin are one of the main minority groups in Japan, along with the Ainu of Hokkaidō and those of Korean or Chinese descent.
|Yangban||양반||兩班||two kinds of aristocrats|
|• Nobi||노비||奴婢||slaves (or "serfs")|
The baekjeong (백정) were an "untouchable" outcaste of Korea. The meaning today is that of butcher. It originates in the Khitan invasion of Korea in the 11th century. The defeated Khitans who surrendered were settled in isolated communities throughout Goryeo to forestall rebellion. They were valued for their skills in hunting, herding, butchering, and making of leather, common skill sets among nomads. Over time, their ethnic origin was forgotten, and they formed the bottom layer of Korean society.
In 1392, with the foundation of the Confucian Joseon dynasty, Korea systemised its own native class system. At the top were the two official classes, the Yangban, which literally means "two classes". It was composed of scholars (munban) and warriors (muban). Scholars had a significant social advantage over the warriors. Below were the jung-in (중인-中人: literally "middle people". This was a small class of specialised professions such as medicine, accounting, translators, regional bureaucrats, etc. Below that were the sangmin (상민-常民: literally 'commoner'), farmers working their own fields. Korea also had a serf population known as the nobi. The nobi population could fluctuate up to about one third of the population, but on average the nobi made up about 10% of the total population. In 1801, the vast majority of government nobi were emancipated, and by 1858 the nobi population stood at about 1.5% of the total population of Korea. The hereditary nobi system was officially abolished around 1886–87 and the rest of the nobi system was abolished with the Gabo Reform of 1894, but traces remained until 1930.
The opening of Korea to foreign Christian missionary activity in the late 19th century saw some improvement in the status of the baekjeong. However, everyone was not equal under the Christian congregation, and even so protests erupted when missionaries tried to integrate baekjeong into worship, with non-baekjeong finding this attempt insensitive to traditional notions of hierarchical advantage. Around the same time, the baekjeong began to resist open social discrimination. They focused on social and economic injustices affecting them, hoping to create an egalitarian Korean society. Their efforts included attacking social discrimination by upper class, authorities, and "commoners", and the use of degrading language against children in public schools.
With the Gabo reform of 1896, the class system of Korea was officially abolished. Following the collapse of the Gabo government, the new cabinet, which became the Gwangmu government after the establishment of the Korean Empire, introduced systematic measures for abolishing the traditional class system. One measure was the new household registration system, reflecting the goals of formal social equality, which was implemented by the loyalists' cabinet. Whereas the old registration system signified household members according to their hierarchical social status, the new system called for an occupation.
While most Koreans by then had surnames and even bongwan, although still substantial number of cheonmin, mostly consisted of serfs and slaves, and untouchables did not. According to the new system, they were then required to fill in the blanks for surname in order to be registered as constituting separate households. Instead of creating their own family name, some cheonmins appropriated their masters' surname, while others simply took the most common surname and its bongwan in the local area. Along with this example, activists within and outside the Korean government had based their visions of a new relationship between the government and people through the concept of citizenship, employing the term inmin ("people") and later, kungmin ("citizen").
The Committee for Human Rights in North Korea reported that "Every North Korean citizen is assigned a heredity-based class and socio-political rank over which the individual exercises no control but which determines all aspects of his or her life." Called Songbun, Barbara Demick describes this "class structure" as an updating of the hereditary "caste system", a combination of Confucianism and Stalinism. It originated in 1946 and was entrenched by the 1960s, and consisted of 53 categories ranging across three classes: loyal, wavering, and impure. The privileged "loyal" class included members of the Korean Workers' Party and Korean People's Army officers' corps, the wavering class included peasants, and the impure class included collaborators with Imperial Japan and landowners. She claims that a bad family background is called "tainted blood", and that by law this "tainted blood" lasts three generations.
There are three hereditary groups, often called castes, in Yazidism. Membership in the Yazidi society and a caste is conferred by birth. Pîrs and Sheikhs are the priestly castes, which are represented by many sacred lineages (Kurdish: Ocax). Sheikhs are in charge of both religious and administrative functions and are divided into three endogamous houses, Şemsanî, Adanî and Qatanî who are in turn divided into lineages. The Pîrs are in charge of purely religious functions and traditionally consist of 40 lineages or clans, but approximately 90 appellations of Pîr lineages have been found, which may have been a result of new sub-lineages arising and number of clans increasing over time due to division as Yazidis settled in different places and countries. Division could occur in one family, if there were a few brothers in one clan, each of them could become the founder of their own Pîr sub-clan (Kurdish: ber). Mirîds are the lay caste and are divided into tribes, who are each affiliated to a Pîr and a Sheikh priestly lineage assigned to the tribe.
Pre-Islamic Sassanid society was immensely complex, with separate systems of social organisation governing numerous different groups within the empire. Historians believe society comprised four social classes, which linguistic analysis indicates may have been referred to collectively as "pistras". The classes, from highest to lowest status, were priests (Persian: Asravan), warriors (Persian: Arteshtaran), secretaries (Persian: Dabiran), and commoners (Persian: Vastryoshan).
In Yemen there exists a hereditary caste, the African-descended Al-Akhdam who are kept as perennial manual workers. Estimates put their number at over 3.5 million residents who are discriminated, out of a total Yemeni population of around 22 million.
Various sociologists have reported caste systems in Africa. The specifics of the caste systems have varied in ethnically and culturally diverse Africa; however, the following features are common – it has been a closed system of social stratification, the social status is inherited, the castes are hierarchical, certain castes are shunned while others are merely endogamous and exclusionary. In some cases, concepts of purity and impurity by birth have been prevalent in Africa. In other cases, such as the Nupe of Nigeria, the Beni Amer of East Africa, and the Tira of Sudan, the exclusionary principle has been driven by evolving social factors.
Among the Igbo of Nigeria – especially Enugu, Anambra, Imo, Abia, Ebonyi, Edo and Delta states of the country – scholar Elijah Obinna finds that the Osu caste system has been and continues to be a major social issue. The Osu caste is determined by one's birth into a particular family irrespective of the religion practised by the individual. Once born into Osu caste, this Nigerian person is an outcast, shunned and ostracised, with limited opportunities or acceptance, regardless of his or her ability or merit. Obinna discusses how this caste system-related identity and power is deployed within government, Church and indigenous communities.
The osu class systems of eastern Nigeria and southern Cameroon are derived from indigenous religious beliefs and discriminate against the "Osus" people as "owned by deities" and outcasts.
The Songhai economy was based on a caste system. The most common were metalworkers, fishermen, and carpenters. Lower caste participants consisted of mostly non-farm working immigrants, who at times were provided special privileges and held high positions in society. At the top were noblemen and direct descendants of the original Songhai people, followed by freemen and traders.
In a review of social stratification systems in Africa, Richter reports that the term caste has been used by French and American scholars to many groups of West African artisans. These groups have been described as inferior, deprived of all political power, have a specific occupation, are hereditary and sometimes despised by others. Richter illustrates caste system in Ivory Coast, with six sub-caste categories. Unlike other parts of the world, mobility is sometimes possible within sub-castes, but not across caste lines. Farmers and artisans have been, claims Richter, distinct castes. Certain sub-castes are shunned more than others. For example, exogamy is rare for women born into families of woodcarvers.
Similarly, the Mandé societies in Gambia, Ghana, Guinea, Ivory Coast, Liberia, Senegal and Sierra Leone have social stratification systems that divide society by ethnic ties. The Mande class system regards the jonow slaves as inferior. Similarly, the Wolof in Senegal is divided into three main groups, the geer (freeborn/nobles), jaam (slaves and slave descendants) and the underclass neeno. In various parts of West Africa, Fulani societies also have class divisions. Other castes include Griots, Forgerons, and Cordonniers.
Tamari has described endogamous castes of over fifteen West African peoples, including the Tukulor, Songhay, Dogon, Senufo, Minianka, Moors, Manding, Soninke, Wolof, Serer, Fulani, and Tuareg. Castes appeared among the Malinke people no later than 14th century, and was present among the Wolof and Soninke, as well as some Songhay and Fulani populations, no later than 16th century. Tamari claims that wars, such as the Sosso-Malinke war described in the Sunjata epic, led to the formation of blacksmith and bard castes among the people that ultimately became the Mali empire.
As West Africa evolved over time, sub-castes emerged that acquired secondary specialisations or changed occupations. Endogamy was prevalent within a caste or among a limited number of castes, yet castes did not form demographic isolates according to Tamari. Social status according to caste was inherited by off-springs automatically; but this inheritance was paternal. That is, children of higher caste men and lower caste or slave concubines would have the caste status of the father.
Ethel M. Albert in 1960 claimed that the societies in Central Africa were caste-like social stratification systems. Similarly, in 1961, Maquet notes that the society in Rwanda and Burundi can be best described as castes. The Tutsi, noted Maquet, considered themselves as superior, with the more numerous Hutu and the least numerous Twa regarded, by birth, as respectively, second and third in the hierarchy of Rwandese society. These groups were largely endogamous, exclusionary and with limited mobility.
Horn of Africa
In a review published in 1977, Todd reports that numerous scholars report a system of social stratification in different parts of Africa that resembles some or all aspects of caste system. Examples of such caste systems, he claims, are to be found in Ethiopia in communities such as the Gurage and Konso. He then presents the Dime of Southwestern Ethiopia, amongst whom there operates a system which Todd claims can be unequivocally labelled as caste system. The Dime have seven castes whose size varies considerably. Each broad caste level is a hierarchical order that is based on notions of purity, non-purity and impurity. It uses the concepts of defilement to limit contacts between caste categories and to preserve the purity of the upper castes. These caste categories have been exclusionary, endogamous and the social identity inherited. Alula Pankhurst has published a study of caste groups in SW Ethiopia.
Among the Kafa, there were also traditionally groups labelled as castes. "Based on research done before the Derg regime, these studies generally presume the existence of a social hierarchy similar to the caste system. At the top of this hierarchy were the Kafa, followed by occupational groups including blacksmiths (Qemmo), weavers (Shammano), bards (Shatto), potters, and tanners (Manno). In this hierarchy, the Manjo were commonly referred to as hunters, given the lowest status equal only to slaves."
The Borana Oromo of southern Ethiopia in the Horn of Africa also have a class system, wherein the Wata, an acculturated hunter-gatherer group, represent the lowest class. Though the Wata today speak the Oromo language, they have traditions of having previously spoken another language before adopting Oromo.
The traditionally nomadic Somali people are divided into clans, wherein the Rahanweyn agro-pastoral clans and the occupational clans such as the Madhiban were traditionally sometimes treated as outcasts. As Gabboye, the Madhiban along with the Yibir and Tumaal (collectively referred to as sab) have since obtained political representation within Somalia, and their general social status has improved with the expansion of urban centers.
European feudalism with its rigid aristocracy can also be considered as a caste system.
For centuries, through the modern times, the majority regarded Cagots who lived primarily in the Basque region of France and Spain as an inferior caste, the untouchables. While they had the same skin color and religion as the majority, in the churches they had to use segregated doors, drink from segregated fonts, and receive communion on the end of long wooden spoons. It was a closed social system. The socially isolated Cagots were endogamous, and chances of social mobility non-existent.
In July 2013, the UK government announced its intention to amend the Equality Act 2010, to "introduce legislation on caste, including any necessary exceptions to the caste provisions, within the framework of domestic discrimination law". Section 9(5) of the Equality Act 2010 provides that "a Minister may by order amend the statutory definition of race to include caste and may provide for exceptions in the Act to apply or not to apply to caste".
From September 2013 to February 2014, Meena Dhanda led a project on "Caste in Britain" for the UK Equality and Human Rights Commission (EHRC).
The existence of a caste system based on the concept of casta in Latin America under colonial Spain has been raised and contemporarily contested, distinguishing it from more general colonial or racial discrimination.
A survey on caste discrimination conducted by Equality Labs[a] found 67% of Indian Dalits living in the US reporting that they faced caste-based harassment at the workplace, and 27% reporting verbal or physical assault based on their caste.
In 2023, Seattle became the first city in the United States to ban discrimination based on caste.
In the opinion of W. Lloyd Warner, discrimination in the Southern United States in the 1930s against Blacks was similar to Indian castes in such features as residential segregation and marriage restrictions. In her 2020 book Caste: The Origins of Our Discontents, journalist Isabel Wilkerson used caste as an analogy to understand racial discrimination in the United States.
Gerald D. Berreman contrasted the differences between discrimination in the United States and India. In India, there are complex religious features which make up the system, whereas in the United States race and color are the basis for differentiation. The caste systems in India and the United States have higher groups which desire to retain their positions for themselves and thus perpetuate the two systems.
The process of creating a homogenized society by social engineering in both India and the Southern US has created other institutions that have made class distinctions among different groups evident. Anthropologist James C. Scott elaborates on how "global capitalism is perhaps the most powerful force for homogenization, whereas the state may be the defender of local difference and variety in some instances". The caste system, a relic of feudalistic economic systems, emphasizes differences between socio-economic classes that are obviated by openly free market capitalistic economic systems, which reward individual initiative, enterprise, merit, and thrift, thereby creating a path for social mobility. When the feudalistic slave economy of the southern United States was dismantled, Jim Crow laws and acts of domestic terrorism committed by white supremacists prevented many industrious African Americans from participating in the formal economy and achieving economic success on parity with their white peers, or destroying that economic success in instances where it was achieved, such as Black wall street, with only rare but commonly touted exceptions of lasting personal success such as Maggie Walker, Annie Malone, and Madame C.J. Walker. Parts of the United States are sometimes divided by race and class status despite the national narrative of integration.
Caste in sociology and entomology
The initial observational studies of the division of labour in ant colonies attempted to demonstrate that ants specialized in tasks that were best suited to their size when they emerged from the pupae stage into the adult stage.  A large proportion of the experimental work was done in species that showed strong variation in size. As the size of an adult was fixed for life, workers of a specific size range came to be called a "caste", calling up the traditional caste system in India in which a human's standing in society was decided at birth.
The notion of caste encouraged a link between scholarship in entomology and sociology because it served as an example of a division of labour in which the participants seemed to be uncompromisingly adapted to special functions and sometimes even unique environments. To bolster the concept of caste, entomologists and sociologists referred to the complementary social or natural parallel and thereby appeared to generalize the concept and give it an appearance of familiarity. In the late 19th- and early 20th centuries, the perceived similarities between the Indian caste system and caste polymorphism in insects were used to create a correspondence or parallelism for the purpose of explaining or clarifying racial stratification in human societies; the explanations came particularly to be employed in the United States. Ideas from heredity and natural selection influenced some sociologists who believed that some groups were predetermined to belong to a lower social or occupational status. Chiefly through the work of W. Lloyd Warner at the University of Chicago, a group of sociologists sharing similar principles came to evolve around the creed of caste in the 1930s and 1940s.
The ecologically-oriented sociologist Robert E. Park, although attributing more weight to environmental explanations than the biological nonetheless believed that there were obstacles to the assimilation of blacks into American society and that an "accommodation stage" in a biracially organized caste system was required before full assimilation. He did disavow his position in 1937, suggesting that blacks were a minority and not a caste. The Indian sociologist Radhakamal Mukerjee was influenced by Robert E. Park and adopted the concept of "caste" to describe race relations in the US. According to anthropologist Diane Rodgers, Mukerjee "proceeded to suggest that a caste system should be correctly instituted in the (US) South to ease race relations." Mukerjee often employed both entomological and sociological data and clues to describe caste systems. He wrote "while the fundamental industries of man are dispersed throughout the insect world, the same kind of polymorphism appears again and again in different species of social insects which have reacted in the same manner as man, under the influence of the same environment, to ensure the supply and provision of subsistence." Comparing the caste system in India to caste polymorphism in insects, he noted, "where we find the organization of social insects developed to perfection, there also has been seen among human associations a minute and even rigid specialization of functions, along with ant- and bee-like societal integrity and cohesiveness." He considered the "resemblances between insect associations and caste-ridden societies" to be striking enough to be "amusing".
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- Lagasse, Paul, ed. (2007), "Caste", The Columbia Encyclopedia, New York, NY: Columbia University Press, ISBN 978-0-231-14446-9, retrieved 24 September 2012 Quote: "caste [Port., casta=basket], ranked groups based on heredity within rigid systems of social stratification, especially those that constitute Hindu India. Some scholars, in fact, deny that true caste systems are found outside India. The caste is a closed group whose members are severely restricted in their choice of occupation and degree of social participation. Marriage outside the caste is prohibited. Social status is determined by the caste of one's birth and may only rarely be transcended."
- Madan, T. N. (2012), caste, Encyclopæida Britannica Online Quote: "caste, any of the ranked, hereditary, endogamous social groups, often linked with occupation, that together constitute traditional societies in South Asia, particularly among Hindus in India. Although sometimes used to designate similar groups in other societies, the "caste system" is uniquely developed in Hindu societies."
- Gupta, Dipankar (2008), "Caste", in Schaefer, Richard T. (ed.), Encyclopedia of Race, Ethnicity, and Society, Thousand Oaks: SAGE, pp. 246–250, ISBN 978-1-4129-2694-2, retrieved 5 August 2012 Quote: "Caste: What makes Indian society unique is the phenomenon of caste. Economic, religious, and linguistic differentiations, even race-based discrimination, are known elsewhere, but nowhere else does one see caste but in India."
- Béteille 2002, pp. 136–137. Quote: "Caste: Caste has been described as the fundamental social institution of India. Sometimes the term is used metaphorically to refer to rigid social distinctions or extreme social exclusiveness wherever found, and some authorities have used the term 'colour-caste system' to describe the stratification based on race in the United States and elsewhere. But it is among the Hindus in India that we find the system in its most fully developed form although analogous forms exist among Muslims, Christians. Sikhs and other religious groups in South Asia. It is an ancient institution, having existed for at least 2,000 years among the Hindus who developed not only elaborate caste practices hut also a complex theory to explain and justify those practices (Dumont 1970). The theory has now lost much of its force although many of the practices continue."
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