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Pan-Slavism was a movement in the mid-19th century aimed at unity of all the Slavic peoples. The main focus was in the Balkans where the South Slavs had been ruled for centuries by other empires, Byzantine Empire, Austria-Hungary, the Ottoman Empire, and Venice. It was also used as a political tool by both the Russian Empire and the Soviet Union, which gained political-military influence and control over all Slavic-majority nations between 1945 and 1948.
Extensive Pan-Slavism began much like Pan-Germanism, both of which grew from the sense of unity and nationalism experienced within ethnic groups under the domination of France during the Napoleonic Wars. Like other Romantic nationalist movements, Slavic intellectuals and scholars in the developing fields of history, philology, and folklore actively encouraged the passion of their shared identity and ancestry. Pan-Slavism also co-existed with the Southern Slavic independence.
The first pan-Slavist was the 17th-century Croatian Catholic missionary Juraj Križanić. Some of the earliest manifestations of Pan-Slavic thought within the Habsburg Monarchy have been attributed to Adam Franz Kollár and Pavel Jozef Šafárik. The movement began following the end of the Napoleonic Wars in 1815. In the aftermath, the leaders of Europe sought to restore the pre-war status quo. At the Congress of Vienna, Austria's representative, Prince von Metternich, felt the threat to this status quo in Austria was the nationalists demanding independence from the empire. While their subjects were composed of numerous ethnic groups (such as Italians, Romanians, Hungarians, etc.), most of the subjects were Slavs.
First Pan-Slav Congress, Prague, 1848 
The First Pan-Slav congress was held in Prague, Bohemia in June, 1848, during the revolutionary movement of 1848. The Czechs had refused to send representatives to the Frankfurt Assembly feeling that Slavs had a distinct interest from the Germans. The Austroslav, František Palacký, presided over the event. Most of the delegates were Czech. Palacký called for the co-operation of the Habsburgs and had also endorsed the Habsburg monarchy as the political formation most likely to protect the peoples of central Europe. When the Germans asked him to declare himself in favour of their desire for national unity, he replied that he would not as this would weaken the Habsburg state: “Truly, if it were not that Austria had long existed, it would be necessary, in the interest of Europe, in the interest of humanity itself, to create it.”
The Pan-Slav congress met during the revolutionary turmoil of 1848. Young inhabitants of Prague had taken to the streets and in the confrontation, a stray bullet had killed the wife of Field Marshal Alfred I, Prince of Windisch-Grätz, the commander of the Austrian forces in Prague. Enraged, Windischgrätz seized the city, disbanded the congress, and established martial law throughout Bohemia.
Pan-Slavism in Central Europe 
The first Pan-Slavic convention was held in Prague on June 2 through 16, 1848. The delegates at the Congress were specifically both anti-Austrian and anti-Russian. Still "the Right"--the moderately liberal wing of the Congress--under the leadership of František Palacký (1798-1876), a Czech historian and politician; and Pavol Jozef Šafárik (1795-1861), a Slovak philologist, historian and archaeologist. favored autonomy of the Slav lands within the framework of Austrian (Hapsburg) monarchy. While "the Left"--the radical wing of the Congress--under the leadership of Karel Sabina (1813-1877) a Czech writer and journalist; Josef Václav Fric, a Czech nationalist; Karol Libelt(1817-1861), a Polish writer and politician and others, pressed for a close alliance with the revolutionary-democratic movement going on in Germany and Hungary in 1848.
However, the Russian Empire often claimed Pan-Slavism as a justication for its aggressive moves in the Balkan Peninsula of Europe and against Turkey. Pan-Slavism has some supporters among Czech politicians but never gained dominant influence, possibly other than treating Czechs and Slovaks as branches of a single multi-ethnic nation.
Creation of an independent Czechoslovakia made the old ideals of Pan-Slavism anachronistic. Relations with other Slavic states varied, sometimes being tense. Even tensions between Czechs and Slovaks had appeared.
Pan-Slavism in the Balkans 
The Southern Slavic movement was active after Serbia regained independence from the Turkish Ottoman Empire. Austria feared that nationalists would endanger the empire. Pan-Slavism in the south was vastly different, instead it often turned to Russia for support. The Southern Slavic movement advocated the independence of the Slavic peoples in Austro-Hungarian Empire and the Ottoman Empire. Some Serbian intellectuals sought to unite all of the Southern, Balkan Slavs, whether Catholic (Croats, Slovenes), Muslim (Bosnian Muslims, Sandžak), or Orthodox (Montenegrins, Serbs, Macedonians), under their rule (under the so-called panserbic ideologue, accordingly as "Serbian nation of three faiths"). Serbia, having just gained independence, was a small nascent state, whereas the Austro-Hungarian Empire, though unstable, was still a strong opponent to Serbia. In this circumstance, the idea of Russia involving the Southern Slavic unity under Serbian helm was favored.
The Southern Slavs were some of the first to revolt against the decaying Ottoman Empire. In 1804 and again in 1815, the Serbs secured autonomy from the Ottomans. Almost immediately after Serbia's autonomy, the Serbs began seeking expansion and unity with all the rest of Serbs and other Slavs in neighbouring regions; project of Greater Serbia under the panserbic intellectual influence of Ilia Garasanin and Vuk Stefanović Karadžić.
In Austria-Hungary Southern Slavs were distributed among several entities: Slovenes in the Austrian part (Carniola, Styria, Carinthia, Gorizia and Gradisca, Trieste, Istria (also Croats)), Croats and Serbs in the Hungarian part within the autonomous Kingdom of Croatia-Slavonia and in the Austrian part within the autonomous Kingdom of Dalmatia, and in Bosnia and Herzegovina, under direct control from Vienna. Due to a different position within Austria-Hungary several different goals were prominent among the Southern Slavs of Austria-Hungary. A strong alternative to Pan-Slavism was Austroslavism, especially among the Slovenes. Because the Serbs were dispersed among several regions, and the fact that they had special ties to the independent nation state of Serbia, they were among the strongest supporters of independence of South-Slavs from Austria-Hungary and uniting into a common state under Serbian monarchy.
After World War I the creation of the Kingdom of Yugoslavia, under Serbian royalty, did unite most Southern Slavic-speaking nations regardless of religion and cultural background. The only ones they did not unite with were the Bulgarians. Still, in the years after the Second World War, there were plans that Bulgaria should join as a 7th republic in communist Yugoslavia, thus uniting all south Slavic-speaking nations into one state. The idea was left after the break between Josip Broz Tito and Joseph Stalin in 1948.
President Tito, a Croat-Slovene, advocated equality among the ethnic groups including non-Slavs. This led to relatively peaceful co-existence and prosperity until the breakup of the federation.
Pan-Slavism in Poland 
Although early Pan-Slavism had found interest among some Poles, it soon lost its appeal as the movement became dominated by Russia, and while Russian Pan-Slavists spoke of liberation of other Slavs through Russian actions, parts of Poland had been ruled by the Russian Empire since the Partitions of Poland. Historically, Poland often saw itself in partnership with non-Slavic nations most of the time, such as Hungary (see the phrase "Pole and Hungarian cousins be"), Saxony, Sweden or Lithuania under the Polish-Lithuanian Commonwealth from 1569 to 1795. Especially after 1795, Revolutionary and Napoleonic France was esteemed by most Poles at that time as the best champion for the reconstitution of their country as it was a mutual enemy of Austria, Prussia and Russia. The influence of 19th century Pan-Slavism had little impact in Poland except for creating sympathy towards the other oppressed Slavic nations to regaining independence. At the same time while Pan-Slavism worked against Austro-Hungary with South Slavs, Poles enjoyed a wide autonomy within the state and assumed a loyalist position as they were able to develop their national culture and preserve Polish language, something under threat in both German and Russian Empires. A Pan-Slavic federation was proposed, but on the condition that the Russian Empire would be excluded from such an entity. After Poland regained its independence (from Germany, Austria and Russia) in 1918 no major or minor force considered Pan-Slavism as a serious alternative, viewing Pan-Slavism as little more than a code word for Russification. During Poland's communist era the USSR used Pan-Slavism as propaganda tool to justify its control over the country. The issue of the Pan-Slavism was not part of the mainstream political agenda, and is widely seen as an ideology of Russian imperialism.
Joseph Conrad in Notes on Life and Letters.:
"...between Polonism and Slavonism there is not so much hatred as a complete and ineradicable incompatibility." ...Conrad argues that "nothing is more foreign than what in the literary world is called Slavonism to his individual sensibility and the whole Polish mentality"
Although, Poland is a member of the Visegrád Group, which although is not Pan-Slavic as it includes one non-Slavic nation, but promotes co-operations among former Eastern Bloc Central European countries. It could be considered simultaneously a platform that promotes fraternity and integration among the West Slavs, who share a common, Central European culture and history, and having similar development. All four Visegrád members are also member of the Central European Initiative.
Modern day developments 
The authentic idea of unity of the Slavic people was all but gone after World War I when the maxim "Versailles and Trianon have put an end to all Slavisms" and was finally put to rest with the fall of communism in Central and Eastern Europe in late 1980s. With the breakup of federal states such as Czechoslovakia and Yugoslavia and the problem of Russian and Serbian dominance in any proposed all-Slavic organisation, the idea of Pan-Slavic unity is mostly considered dead. Varying relations between the Slavic countries exist nowadays; they range from mutual respect on equal footing and sympathy towards one another through traditional dislike and enmity, to indifference. None, other than culture and heritage oriented organizations, are currently considered as a form of rapprochement among the countries with Slavic origins. In modern times the appeals to Pan-Slavism are often made in Belarus, Russia, Serbia and Slovakia.
Creation of Pan-Slavic languages 
The similarity of Slavic languages inspired many people to create Pan-Slavic languages, i.e., zonal constructed languages for all Slavic people to communicate with one another. Several of these languages were created in the past, but due to the Internet, many more Pan-Slavic languages were created in the Digital Age. The most popular modern Pan-Slavic languages are Slovio and Slovianski.
See also 
- Pan-Slavism in "Encyclopedia of the United Nations and International Agreements" by Edmund Jan Osmanczyk
- Nicholas Valentine Riasanovsky, A History of Russia, p. 450, Oxford University Press US, 2006, ISBN 0-19-512179-1.
- A. Grigorieva Pan-Slavism in Central and Southeastern Europe // Journal of Siberian Federal University. Humanities & Social Sciences 1 (2010 3) 13-21.
- John M. Letiche and Basil Dmytryshyn: "Russian Statecraft: The Politika of Iurii Krizhanich", Oxford and New York, 1985
- Robert John Weston Evans, Chapter "Nationality in East-Central Europe: Perception and Definition before 1848." Austria, Hungary, and the Habsburgs: Essays on Central Europe, c.1683-1867. 2006.
- See Note 134 on page 725 of the Collected Works of Karl Marx and Frederick Engels: Volume 14 (International Publishers: New York, 1980).
- See the biographical note on page 784 of the Collected Works of Karl Marx and Frederick Engels: Volume 14.
- See the biographical note at page 787 of the Collected Works of Karl Marx and Frederick Engels: Volume 14
- See Note 134 on page 725 of the Collected Works of Karl Marx and Frederick Engels: Volume 14.
- See Note 134 on page 725 of the Collected Works of Karl Marx and Frederick Engels: Volume 14.
- Frederick Engels, "Germany and Pan-Slavism" contained in the Collected Works of Karl Marx and Frederick Engels: Volume 14, pp. 156-158.
- Ramet, Sabrina P.; The three Yugoslavias: state-building and legitimation, 1918-2005; Indiana University Press, 2006 ISBN 0-253-34656-8
- Notes on Life and Letters
- Comparative Slavic Studies Volume 6, by Roman Jakobson
- "In other words, the Pan-Slavic resentment is not strange to the Russian Eurasianists, however, this is prevailingly limited to the post-Soviet space. Therein lies the difference between the Eurasians and the Russian radical nationalists in their contemporary attitude to Pan-Slavism. Radical nationalists are the only ones who follow up with the tradition and ideational message of the Central- and South-European Pan-Slavism of the tsarist Russia. Pan-Slavism serves as their tool for demonstrating decisive anti-Western attitudes and as an "historical" folklore employed in domestic-political battles, which sound so sweet to the Russian ear. The ideas of Pan-Slavism only find some echo with the part of some Serbian and partly Slovak nationalists" Alexander Duleba, "From Domination to Partnership - The perspectives of Russian-Central-East European Relations", Final Report to the NATO Research Fellowship Program, 1996-1998 
- Slavic unity forum (multiple languages)