First Vienna Award in the context of "First Czechoslovak Republic"

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.

Slovakia, officially the (First) Slovak Republic, and from 14 March until 21 July 1939 officially known as the Slovak State (Slovak: Slovenský štát), was a partially recognized clerical fascist client state of Nazi Germany which existed between 14 March 1939 and 4 April 1945 in Central Europe. The Slovak part of Czechoslovakia declared independence with German support one day before the German occupation of Bohemia and Moravia. It controlled most of the territory of present-day Slovakia, without its current southern parts, which were ceded by Czechoslovakia to Hungary in 1938. The puppet state was the first formally independent Slovak state in history. Bratislava was declared the capital city.

A one-party state governed by the far-right Hlinka's Slovak People's Party, the Slovak Republic is primarily known for its collaboration with Nazi Germany, which included sending troops to the invasion of Poland in September 1939 and the Soviet Union in 1941. In 1940, the country joined the Axis when its leaders signed the Tripartite Pact.

The Second Czechoslovak Republic (Czech and Slovak: Druhá Česko-Slovenská republika), officially the Czecho-Slovak Republic (Czech and Slovak: Česko-Slovenská republika), existed for 169 days, between 30 September 1938 and 15 March 1939. It was composed of Bohemia, Moravia, Silesia and the autonomous regions of Slovakia and Subcarpathian Rus', the latter being renamed Carpathian Ukraine on 30 December 1938.

The Second Republic was the result of the events following the Munich Agreement, where Czechoslovakia was forced to cede the German-populated Sudetenland region to Germany on 1 October 1938. After the Munich Agreement and the German government made clear to foreign diplomats that Czechoslovakia was now a German client state, the Czechoslovak government attempted to curry favour with Germany by banning the country's Communist Party, suspending all Jewish teachers in German educational institutes in Czechoslovakia, and enacted a law to allow the state to take over Jewish companies. In addition, the government allowed the country's banks to effectively come under German–Czechoslovak control. On 2 November, by the First Vienna Award, the southern parts of Slovakia and Subcarpathian Ruthenia were ceded to Hungary.