Page "Geography of Hungary" Paragraph 2

Hungary's modern borders were first established after World War I when, by the terms of the Treaty of Trianon in 1920, it lost more than 71 % of what had formerly been the Kingdom of Hungary, 58. 5 % of its population, and 32 % of the Hungarians.

The country secured some boundary revisions from 1938 to 1941: In 1938 the First Vienna Award gave back territory from Czechoslovakia, in 1939 Hungary occupied Carpatho-Ukraine.

In 1940 the Second Vienna Award gave back Northern Transylvania and finally Hungary occupied the Bácska and Muraköz regions during the Invasion of Yugoslavia.

However, Hungary lost these territories again with its defeat in World War II.

After World War II, the Trianon boundaries were restored with a small revision that benefited Czechoslovakia.