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Carpatho-Ukraine (Ukrainian: Карпатська Україна, Karpats’ka Ukrayina) was an autonomous region within Czechoslovakia from late 1938 to March 15, 1939. It declared itself an independent republic on March 15, 1939, but was returned to Hungary between March 15 and March 16, 1939, remaining under Hungarian control until the Nazi occupation of Hungary in 1944.