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Forced assimilation is an involuntary process of cultural assimilation of religious or ethnic minority groups during which they are forced to adopt language, identity, norms, mores, customs, traditions, values, mentality, perceptions, way of life, and often religion and ideology of established and generally larger community belonging to dominant culture by government. Also enforcement of a new language in legislation, education, literature, worshiping counts as forced assimilation. Unlike ethnic cleansing, the local population is not outright destroyed and may or may not be forced to leave a certain area. Instead the population becomes assimilated by force. It has often been used after an area has changed nationality, often in the aftermath of war. Some examples are both the German and French forced assimilation in the provinces Alsace and (at least a part of) Lorraine, and some decades after the Swedish conquests of the Danish provinces Scania, Blekinge and Halland the local population was submitted to forced assimilation, or even the forced assimilation of ethnic Chinese in Bangkok by the Siam government during World War I until the 1973 uprising. Forced assimilation is also called cultural genocide and ethnocide.
If a state puts extreme emphasis on a homogeneous national identity, it may resort, especially in the case of minorities originating from historical foes, to harsh, even extreme measures to 'exterminate' the minority culture, sometimes to the point of considering the only alternative its physical elimination (expulsion or even genocide).
States, mostly based on the idea of nation, perceived the presence of ethnic or linguistic minorities as a danger for their own territorial integrity. In fact minorities could claim their own independence, or to be rejoined with their own motherland. The consequence was the weakening or disappearing of several ethnic minorities. Forced migrations took place after each of the two world wars.
The latter half of the 19th century and the first half of the 20th century saw the rise of nationalism. Previously, a country consisted largely of whatever peoples lived on the land that was under the dominion of a particular ruler. Thus, as principalities and kingdoms grew through conquest and marriage, a ruler could wind up with peoples of many different ethnicities under his dominion. This also reflected the long history of migrations of different tribes and peoples through Europe.
The concept of nationalism was based on the idea of a "people" who shared a common bond through race, religion, language and culture. Furthermore, nationalism asserted that each "people" had a right to its own nation. Much of European history in the latter half of the 19th century and the first half of the 20th century can be understood as efforts to realign national boundaries with this concept of "one people, one nation". Such scenes also happened in Japan and Korea, as the two countries stated themselves as a single-nation country, ethnic minorities had to hide their national identity for centuries, and many resulted in assimilation, such as Ainu and Ryukyuan people in Japan, migrants of Goguryeo, Balhae and Tungusic peoples in Korea. Similarly, Thailand sought to assimilate its many Chinese immigrants by only granting Thai citizenship if they renounced all loyalty to China, learned to speak Thai, changed their names, and sent their children to Thai schools.  Much conflict would arise when one nation asserted territorial rights to land outside its borders on the basis of a common bond with the people living on that land. (Example: organized territorial rights by Russia for Georgia's breakaway province of South Ossetia to North Ossetia) Another source of conflict arose when a group of people who constituted a minority in one nation would seek to secede from the nation either to form an independent nation or join another nation with whom they felt stronger ties. Yet another source of conflict was the desire of some nations to expel people from territory within its borders on the ground that those people did not share a common bond with the majority of people living in that nation.[specify]
It is useful to contrast the mass migrations and forced expulsion of ethnic Germans out of Eastern Europe with other massive transfers of populations, such as population exchange between Greece and Turkey, and population exchanges that occurred after the Partition of India. In all cases those expelled suffered greatly.
In the United States, during the great war, the American government did burn most German books. Banned the use of german in public places and renamed a lot of places that previously had German names with more English-sounding words. The forced assimilation was highly successful. Before that, the German American community at large had refused assimilation and retained their German traditions such as beers on Sundays. German also was the mayor language in many parts of the country.  
In the United States and Canada, forced assimilation had been practiced against indigenous peoples through the Indian residential school system and Indian boarding schools. The same assimilation was also faced by French and Spanish speaking peoples populating the US and Canada, through language bans, violence, and extreme prejudice by anglophones into and throughout the 20th century.
At least one million members of China's Muslim Uyghur minority have been detained in mass detention camps in Xinjiang, termed "reeducation camps", aimed at changing the political thinking of detainees, their identities, and their religious beliefs.
In December 2017, Reuters reported that "Ukraine’s neighbors have a right to criticize a new Ukrainian law banning schools from teaching in minority languages beyond primary school level, a leading European rights watchdog said".
Beginning in 2019, instruction in Russian language will be gradually discontinued in private colleges and universities in Latvia, as well as general instruction in Latvian public high schools. Permanent Representative of the Russian Federation to the Organization for Security and Co-operation in Europe Alexander Lukashevich has denounced the reform as a "discriminatory policy with the goal of forced assimilation of the Russian-speaking population."
In Hungary, Romani people were forced to assimilated to Hungarian society. Romani people are known for their lack of education, unemployment and lack of assimilation in society due to their fear of gadje.
Throughout the Middle Ages and until the mid-19th century, most Jews in Europe were forced to live in small towns (shtetls) and were restricted from entering universities or high-level professions. See also Christianity in Pakistan for contemporary issues.
When new immigrants enter a country, there is a tension as they adapt to new people and surroundings to fit in, while holding on to their original culture. Here, studies show that native inhabitants often expect assimilation especially from negatively viewed immigrants. Moreover, assimilation pressure seems to be particularly pronounced toward the second generation of these immigrants.
- Affirmative action in China
- Assimilation (phonology)
- Cultural appropriation
- Cultural assimilation of Native Americans
- Cultural imperialism
- Diaspora politics
- Ethnic interest group
- Forced conversion
- Human rights in China
- Intercultural competence
- Linguistic discrimination
- Language shift
- Language death
- Mexicans in Omaha, Nebraska
- "More Irish than the Irish themselves"
- Stolen Generations
- Baker, Chris and Pasuk Phongpaichit. A History of Thailand: Third Edition, Cambridge UP, 2014, p. 130.
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- When German Immigrants Were America’s Undesirables. (2019). Retrieved 10 October 2020, from https://www.history.com/news/anti-german-sentiment-wwi
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- Carpenter, Mary. "Lost Generations". Canada's History. Retrieved 11 July 2020.
- Cronin-Furman, Kate. "China Has Chosen Cultural Genocide in Xinjiang—For Now". Foreign Policy. Retrieved 2018-09-20.
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- "Government okays transition to Latvian as sole language at schools in 2019". Public Broadcasting of Latvia. January 23, 2018.
- "Latvia's school language reform irks Russian minority". EURACTIV. June 25, 2018. Retrieved August 11, 2018.
- Hajnáczky, Tamás (2020). "The forced assimilation Gypsy policy in Socialist Hungary". Romani Studies. 30 (1): 49–87. doi:10.3828/rs.2020.3. S2CID 220495578.
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- Montreuil, Annie; Bourhis, Richard Y. (2004). "Acculturation orientations of competing host communities toward valued and devalued immigrants". International Journal of Intercultural Relations. 28 (6): 507–532. doi:10.1016/j.ijintrel.2005.01.002.
- Kunst, Jonas R.; Sam, David L. (2014). ""It's on Time That They Assimilate" – Differential acculturation expectations towards first and second generation immigrants". International Journal of Intercultural Relations. 39: 188–195. doi:10.1016/j.ijintrel.2013.10.007.