Carpathian Ruthenia in the context of "Carpathian Basin"

The First Czechoslovak Republic, often colloquially referred to as the First Republic, was the first Czechoslovak state that existed from 1918 to 1938, a union of ethnic Czechs and Slovaks. The country was commonly called Czechoslovakia, a compound of Czech and Slovak; which gradually became the most widely used name for its successor states. It was composed of former territories of Austria-Hungary, inheriting different systems of administration from the formerly Austrian (Bohemia, Moravia, a small part of Silesia) and Hungarian territories (mostly Upper Hungary and Carpathian Ruthenia).

After 1933, Czechoslovakia remained the only de facto functioning democracy in Central Europe, organized as a parliamentary republic. Under pressure from its Sudeten German minority, supported by neighbouring Nazi Germany, Czechoslovakia was forced to cede its Sudetenland region to Germany on 1 October 1938 as part of the Munich Agreement. It also ceded southern parts of Slovakia and Carpathian Ruthenia to Hungary and the Trans-Olza region in Silesia to Poland. This, in effect, ended the First Czechoslovak Republic. It was replaced by the Second Czechoslovak Republic, which lasted less than half a year before Germany occupied the rest of Czechoslovakia in March 1939.

Czechoslovakia (/ˌtʃɛkoʊsloʊˈvæki.ə, ˈtʃɛkə-, -slə-, -ˈvɑː-/ CHEK-oh-sloh-VAK-ee-ə, CHEK-ə-, -⁠slə-, -⁠VAH-; Czech and Slovak: Československo, Česko-Slovensko) was a landlocked country in Central Europe created in 1918 when it declared its independence from Austria-Hungary. In 1938, after the Munich Agreement, the Sudetenland became part of Nazi Germany. Between 1939 and 1945, the state ceased to exist, as Slovakia proclaimed its independence and Carpathian Ruthenia became part of Hungary, while the German Protectorate of Bohemia and Moravia was proclaimed in the remainder of the Czech Lands. In 1939, after the outbreak of World War II, former Czechoslovak president Edvard Beneš formed a government-in-exile and sought recognition from the Allies.

After World War II, Czechoslovakia was re-established under its pre-1938 borders, with the exception of Carpathian Ruthenia, which became part of the Ukrainian SSR (a republic of the Soviet Union). The Communist Party seized power in a coup in 1948. From 1948 to 1989, Czechoslovakia was part of the Eastern Bloc with a planned economy. Its economic status was formalized in membership of Comecon from 1949 and its defense status in the Warsaw Pact of 1955. A period of political liberalization in 1968, the Prague Spring, ended when the Soviet Union, assisted by other Warsaw Pact countries, invaded Czechoslovakia. In 1989, as Marxist–Leninist governments and communism were ending all over Central and Eastern Europe, Czechoslovaks peacefully deposed their communist government during the Velvet Revolution, which began on 17 November 1989 and ended 11 days later on 28 November when all of the top Communist leaders and Communist party itself resigned. On 31 December 1992, Czechoslovakia split peacefully into the two sovereign states of the Czech Republic and Slovakia.

The military occupation of Czechoslovakia by Nazi Germany began with the German annexation of the Sudetenland in 1938, continued with the creation of the Protectorate of Bohemia and Moravia, and by the end of 1944 extended to all parts of Czechoslovakia.

Following the Anschluss of Austria in March 1938 and the Munich Agreement in September of that same year, Adolf Hitler annexed the Sudetenland from Czechoslovakia on 1 October, giving Germany control of the extensive Czechoslovak border fortifications in this area. The incorporation of the Sudetenland into Germany left the rest of Czechoslovakia ("Rest-Tschechei" ) with a largely indefensible northwestern border. Also a Polish-majority borderland region of Trans-Olza which was annexed by Czechoslovakia in 1919, was occupied and annexed by Poland following the two-decade long territorial dispute. Finally the First Vienna Award gave to Hungary the southern territories of Slovakia and Carpathian Ruthenia, mostly inhabited by Hungarians.

Rusyn (/ˈruːsɪn/ ROO-sin; Carpathian Rusyn: русиньскый язык, romanized: rusîn'skyj jazyk; Pannonian Rusyn: руски язик, romanized: ruski jazik) is an East Slavic language spoken by Rusyns in parts of Central and Eastern Europe, and written in the Cyrillic script. The majority of speakers live in Carpathian Ruthenia, which includes Transcarpathia and parts of eastern Slovakia and south-eastern Poland. There is also a sizeable Pannonian Rusyn linguistic island in Vojvodina, Serbia, and a Rusyn diaspora worldwide. Under the European Charter for Regional or Minority Languages, it is recognized as a protected minority language by Bosnia and Herzegovina, Croatia, Hungary, Romania, Poland (as Lemko), Serbia, and Slovakia.

The categorization of Rusyn as a language or dialect is a source of controversy. Czech, Slovak, and Hungarian, as well as American and some Polish and Serbian linguists treat it as a distinct language (with its own ISO 639-3 code), whereas other scholars (in Ukraine, Poland, Serbia, and Romania) treat it as a dialect of Ukrainian.

Western Ukraine or West Ukraine (Ukrainian: Західна Україна, romanized: Zakhidna Ukraina, IPA: [ˈzɑxidnɐ ʊkrɐˈjinɐ]) refers to the western territories of Ukraine. There is no universally accepted definition of the territory's boundaries, but the contemporary Ukrainian administrative regions (oblasts) of Chernivtsi, Ivano-Frankivsk, Lviv, Ternopil and Zakarpattia (which were part of the former Austro-Hungarian Empire) are typically included. In addition, Volyn and Rivne oblasts (parts of the territory annexed from the Polish–Lithuanian Commonwealth during its Third Partition) are also usually included. In modern sources, Khmelnytskyi Oblast is often included because of its geographical, linguistic and cultural association with Western Ukraine, although this cannot be confirmed from a historical and political point of view. It includes several historical regions such as Carpathian Ruthenia, Halychyna including Pokuttia (the eastern portion of Eastern Galicia), most of Volhynia, northern Bukovina and the Hertsa region, and Podolia. Western Ukraine is sometimes considered to include areas of eastern Volhynia, Podolia, and the small northern portion of Bessarabia.

The area of Western Ukraine was ruled by various polities, including the Kingdom of Galicia–Volhynia, which became part of the Polish–Lithuanian Commonwealth, but also the Principality of Moldavia; it would then variously come under rule of the Austrian Empire, Austria-Hungary, the Second Polish Republic, the Kingdom of Romania, and finally the Soviet Union (via the Ukrainian Soviet Socialist Republic) in 1939 and 1940 following the invasion of Poland and the Soviet occupation of Bessarabia and Northern Bukovina, with the borders finalized after the end of World War II. After the dissolution of the Soviet Union, it became part of the independent Ukrainian state.

Zakarpattia Oblast (Ukrainian: Закарпатська область), also referred to as simply Zakarpattia (Ukrainian: Закарпаття; Hungarian: Kárpátalja) or Transcarpathia in English, is an oblast located in the Carpathian Mountains in western Ukraine, mostly coterminous with the historical region of Carpathian Ruthenia. Its administrative centre is the city of Uzhhorod. Other major cities within the oblast include Mukachevo, Khust, Berehove, and Chop, the last of which is home to railroad transport infrastructure.

Zakarpattia Oblast was established on 22 January 1946, following Czechoslovakia's abandonment of its claim to the territory of Subcarpathian Ruthenia (Czech and also Slovak: Podkarpatská Rus) under a treaty between Czechoslovakia and the Soviet Union. The territory of Subcarpathian Ruthenia was then taken over by the USSR and became part of the Ukrainian SSR.

The West Ukrainian People's Republic (Ukrainian: Західноукраїнська Народна Республіка (ЗУНР), romanized: Zakhidnoukrainska Narodna Respublika [ZUNR]; see other names) was a short-lived state that controlled most of Eastern Galicia from November 1918 to July 1919. It included major cities of Lviv, Ternopil, Kolomyia, Drohobych, Boryslav, Stanyslaviv and right-bank Peremyshl. Apart from lands of Eastern Galicia, it also claimed the northern part of Bukovyna and the Carpathian Ruthenia. Politically, the Ukrainian National Democratic Party (the precursor of the interwar Ukrainian National Democratic Alliance) dominated the legislative assembly, guided by varying degrees of Greek Catholic, liberal and socialist ideology. Other parties represented included the Ukrainian Radical Party and the Christian Social Party.

The ZUNR emerged as a breakaway state amid the dissolution of Austria-Hungary, and in January 1919 nominally united with the Ukrainian People's Republic (UPR) as its autonomous Western Oblast. Poland had also claimed this territory, and by July occupied most of it and forced the West Ukrainian government into exile. When the UPR decided late the same year that it would trade the territory for an alliance with Poland against Soviet Russia, the exiled West Ukrainian government broke with the UPR. The exiled government continued its claim until it dissolved in 1923.

Carpathian Ruthenia (also called Carpatho-Rus, Subcarpathian Ruthenia, and Transcarpathia) was a region in the easternmost part of Czechoslovakia which in September 1938 became an autonomous region within that country. On 15 March 1939 it declared its independence as the "Republic of Carpatho-Ukraine"; however, on that same day it was occupied and annexed by Hungary.

Beginning in October 1944, the territory was occupied by the Soviet Red Army and was briefly organized as Transcarpathian Ukraine (1944—1946) [uk], until in 1946 it was incorporated into the Ukrainian Soviet Socialist Republic.