Czechoslovakia (or Czecho-Slovakia; Czech and Slovak: Ceskoslovensko, Cesko-Slovensko) was a sovereign state in Central Europe which existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic and Slovakia on 1 January 1993.
 
From 1939 to 1945, following its forced division and partial incorporation into Nazi Germany, the state did not de facto exist but its government-in-exile continued to operate. In 1945, the eastern part of Carpathian Ruthenia was taken over by the Soviet Union.

The area was long a part of the Austro Hungarian Empire until the Empire collapsed at the end of World War I. The new state was founded by Tomáš Garrigue Masaryk (1850–1937), who served as its first president from 14 November 1918 to 14 December 1935. He was succeeded by his close ally, Edvard Beneš (1884–1948).
 
The roots of Czech nationalism go back to the 19th century, when philologists and educators, influenced by Romanticism, promoted the Czech language and pride in the Czech people. Nationalism became a mass movement in the last half of the 19th century. Taking advantage of the opportunities for limited participation in political life available under the Austrian rule, Czech leaders such as historian František Palacký (1798–1876) founded many patriotic, self-help organizations which provided a chance for many of their compatriots to participate in communal life prior to independence. At first, Palacký supported Austroslavism and worked for reorganized, federal, and Slavic-dominated Austrian Empire, which would protect Slavic peoples against Russian and German threats. The failure of the Revolution of 1848, however, crushed his hopes for Austroslavism.
 
An advocate of democratic reform and Czech autonomy within Austria-Hungary, Masaryk was elected twice to Reichsrat (Austrian Parliament), the first time being from 1891 to 1893 in the Young Czech Party and again from 1907 to 1914 in the Czech Realist Party, which he founded in 1889 with Karel Kramár and Josef Kaizl. With the outbreak of World War I, Masaryk began working for Czech independence in union with Slovakia. With Edvard Beneš and Milan Rastislav Štefánik, Masaryk visited several Western countries and won support from influential publicists.
 
Bohemia and Moravia, under Austrian rule, were Czech-speaking industrial centres, while Slovakia, which was part of Hungary, was an undeveloped agrarian region. Conditions were much better for the development of a mass national movement in the Czech lands than in Slovakia. Nevertheless, the two regions united and created a new nation.
 
Founding
History of Czechoslovakia (1918–1938)
Czechoslovakia was founded in October 1918, as one of the successor states of Austro-Hungarian Empire at the end of World War I and as part of the Treaty of St. Germain. It consisted of the present day territories of the Czech Republic, Slovakia and Carpathian Ruthenia. Its territory included some of the most industrialized regions of the former Austria-Hungary.
 
Ethnicity
The new country was a multi-ethnic state. The population consisted of Czechs (51%), Slovaks (16%), Germans (22%), Hungarians (5%) and Rusyns (4%). Many of the Germans, Hungarians, Ruthenians and Poles and some Slovaks, felt oppressed because the political elite did not generally allow political autonomy for minority ethnic groups. This policy, combined with increasing Nazi propaganda especially in the industrialized German-speaking Sudetenland, led to unrest among the non-Czech population.
 
The state proclaimed the official ideology that there are no Czechs and Slovaks, but only one nation of Czechoslovaks (see Czechoslovakism), to the disagreement of Slovaks and other ethnic groups. Once a unified Czechoslovakia was restored after World War II (after the country had been divided during the war), the conflict between the Czechs and the Slovaks surfaced again. The governments of Czechoslovakia and other eastern European nations deported ethnic Germans to the West, reducing the presence of minorities in the nation. Most of the Jews had been exterminated during the war by the Nazis and their allies.

In 1938, Adolf Hitler demanded control of the Sudetenland. Britain, and France at the Munich Conference ceded the control in the Appeasement, ignoring the military alliance Czechoslovakia had with France. In 1939, the remainder ("rump") of Czechoslovakia was invaded by Nazi Germany and divided into the Protectorate of Bohemia and Moravia and the puppet Slovak State. Much of Slovakia and all of Subcarpathian Ruthenia were annexed by Hungary. Poland occupied Zaolzie, an area with Polish minority, in October 1938.
 
The eventual goal of the German state under Nazi leadership was to eradicate Czech nationality through assimilation, deportation, and extermination of the Czech intelligentsia; the intellectual elites and middle class made up a considerable number of the 200,000 people who passed through concentration camps and the 250,000 who died during German occupation. Under Generalplan Ost, it was assumed that around 50% Czechs would be fit for Germanization. The Czech intellectual elites were to be removed not only from Czech territories but from Europe completely. The authors of Generalplan Ost believed it would be best if they emigrated overseas, as even in Siberia they were considered a threat to German rule. Just like Jews, Poles, Serbs, and several other nations, Czechs were considered to be untermenschen by the Nazi state.
 
The deportation of Jews to concentration camps was organized, and the fortress town of Terezín was made into a ghetto way station for Jewish families. On 4 June 1942 Heydrich died after being wounded by an assassin in Operation Anthropoid. Heydrich's successor, Colonel General Kurt Daluege, ordered mass arrests and executions and the destruction of the villages of Lidice and Ležáky. In 1943 the German war effort was accelerated. Under the authority of Karl Hermann Frank, German minister of state for Bohemia and Moravia, some 350,000 Czech labourers were dispatched to the Reich. Within the protectorate, all non-war-related industry was prohibited. Most of the Czech population obeyed quiescently up until the final months preceding the end of the war, while thousands were involved in the resistance movement.
 
For the Czechs of the Protectorate Bohemia and Moravia, German occupation was a period of brutal oppression. Czech losses resulting from political persecution and deaths in concentration camps totaled between 36,000 and 55,000. The Jewish population of Bohemia and Moravia (118,000 according to the 1930 census) was virtually annihilated. Many Jews emigrated after 1939; more than 70,000 were killed; 8,000 survived at Terezín. Several thousand Jews managed to live in freedom or in hiding throughout the occupation.
 
Despite the estimated 136,000 deaths at the hands of the Nazi regime, the population in the Reichsprotektorate saw a net increase during the war years of approximately 250,000 in line with an increased birth rate.
 
On 9 May 1945, Soviet Red Army troops entered Prague.
 
Communist Czechoslovakia
History of Czechoslovakia (1948–1989)
After World War II, pre-war Czechoslovakia was re-established, with the exception of Subcarpathian Ruthenia, which was annexed by the Soviet Union and incorporated into the Ukrainian Soviet Socialist Republic. The Beneš decrees were promulgated concerning ethnic Germans (see Potsdam Agreement) and ethnic Hungarians. Under the decrees, citizenship was abrogated for people of German and Hungarian ethnic origin, who had accepted German or Hungarian citizenship during the occupations. In 1948, this provision was cancelled for the Hungarians, but only partially for the Germans. The government then confiscated the property of the Germans and expelled about 90% of the ethnic German population, over 2 million people. Those who remained were collectively accused of supporting the Nazis after the Munich Agreement, as 97.32% of Sudeten Germans voted for the NSDAP in the December 1938 elections. Almost every decree explicitly stated that the sanctions did not apply to antifascists. Some 250,000 Germans, many married to Czechs, some antifascists, and also those required for the post-war reconstruction of the country, remained in Czechoslovakia. The Beneš Decrees still cause controversy among nationalist groups in the Czech Republic, Germany, Austria and Hungary.
 
Carpathian Ruthenia was occupied by (and in June 1945 formally ceded to) the Soviet Union. In the 1946 parliamentary election, the Communist Party of Czechoslovakia was the winner in the Czech lands, and the Democratic Party won in Slovakia. In February 1948 the Communists seized power. Although they would maintain the fiction of political pluralism through the existence of the National Front, except for a short period in the late 1960s (the Prague Spring) the country was characterised by the absence of liberal democracy. While its economy remained more advanced than those of its neighbours in Eastern Europe, Czechoslovakia grew increasingly economically weak relative to Western Europe.
 
In 1968, when the reformer Alexander Dubcek was appointed to the key post of First Secretary of the Czechoslovak Communist Party, there was a brief period of liberalization known as the Prague Spring. In response, after failing to persuade the Czechoslovak leaders to change course, five other Eastern Bloc members of the Warsaw Pact invaded. Soviet tanks rolled into Czechoslovakia on the night of 20–21 August 1968. The General Secretary of the Soviet Communist Party Leonid Brezhnev viewed this intervention as vital to the preservation of the Soviet, socialist system and vowed to intervene in any state that sought to replace Marxism-Leninism with capitalism. In the week after the invasion there was a spontaneous campaign of civil resistance against the occupation. This resistance involved a wide range of acts of non-cooperation and defiance: this was followed by a period in which the Czechoslovak Communist Party leadership, having been forced in Moscow to make concessions to the Soviet Union, gradually put the brakes on their earlier liberal policies. In April 1969 Dubcek was finally dismissed from the First Secretaryship of the Czechoslovak Communist Party. Meanwhile, one plank of the reform programme had been carried out: in 1968-9, Czechoslovakia was turned into a federation of the Czech Socialist Republic and Slovak Socialist Republic. The theory was that under the federation, social and economic inequities between the Czech and Slovak halves of the state would be largely eliminated. A number of ministries, such as education, now became two formally equal bodies in the two formally equal republics. However, the centralised political control by the Czechoslovak Communist Party severely limited the effects of federalisation.
 
The 1970s saw the rise of the dissident movement in Czechoslovakia, represented (among others) by Václav Havel. The movement sought greater political participation and expression in the face of official disapproval, manifested in limitations on work activities, which went as far as a ban on professional employment, the refusal of higher education for the dissidents' children, police harassment and prison.
 

After 1989
History of Czechoslovakia (1989–1992)
In 1989, the Velvet Revolution restored democracy. This occurred at around the same time as the fall of communism in Romania, Bulgaria, Hungary and Poland. Within three years communist rule was extirpated from Europe.
 
Unlike Yugoslavia and the Soviet Union, the end of communism in this country did not automatically mean the end of the "communist" name: the word "socialist" was removed from the name on 29 March 1990 and replaced by "federal".
 
In 1992, because of growing nationalist tensions, Czechoslovakia was peacefully dissolved by parliament. On 1 January 1993 it formally separated into two completely independent countries: the Czech Republic and the Slovak Republic.