The Czechoslovak National Front coalition government, formed at Kosice in April 1945, issued decrees providing for the expulsion of all Sudeten Germans with the exception of those who had demonstrated loyalty to the republic. German property would be confiscated without compensation. All officials of the SdP, or the Sudeten Nazis, and all members of the Nazi Security Police would be prosecuted.

In May 1945, Czechoslovak troops took possession of the Sudetenland. A Czechoslovak administrative commission composed exclusively of Czechs was established. Sudeten Germans were subjected to restrictive measures and conscripted for compulsory labor to repair war damages. Individual acts of retaliation against Germans and precipitous expulsion under harsh conditions characterized the immediate aftermath of the occupation. On June 15, however, Benes called Czechoslovak authorities to order. In July Czechoslovak representatives addressed the Potsdam Conference (the United States, Britain, and the Soviet Union) and presented plans for a humane and orderly transfer of the Sudeten German population.

The Potsdam Agreement provided for the resettlement of Sudeten Germans in Germany under the supervision of the Allied Control Council. The transfer began in January 1946. By December 31, 1946, some 1.7 million Germans had been resettled in the American Zone and 750,000 in the Soviet Zone. Approximately 225,000 Germans remained in Czechoslovakia, of whom 50,000 emigrated or were expelled soon after.

The Potsdam Agreement pertained to Germans only. Decisions regarding the Hungarian minority reverted to the Czechoslovak government. The resettlement of about 700,000 Hungarians was envisaged at Kosice and subsequently reaffirmed by the National Front. Budapest, however, opposed a unilateral transfer. In February 1946, the Hungarian government agreed that Czechoslovakia could expatriate as many Hungarians as there were Slovaks in Hungary wishing to return to Czechoslovakia. By the spring of 1948 only 160,000 Hungarians had been resettled.

Territory ceded to Poland in 1938 and restored to Slovakia after the Nazi invasion of Poland, in accordance with the terms of the German-Slovak agreement of November 21, 1939, became part of the restored Czechoslovak state in 1945. The Polish minority (100,000) enjoyed full civil liberties.

Data as of August 1987