The Kingdom of Yugoslavia or Jugoslavia was a kingdom in the Balkans which existed during the often-tumultous interwar era of 1918-1939. Its provinces were named (from north to south) Slovenia, Croatia, Bosnia and Herzegovina, Serbia, Montenegro, while the regions of Kosovo and Vojvodina remained as municipalities of the Serbian province. For its first eleven years of existence it was known as the Kingdom of Serbs, Croats and Slovenes, but the term Yugoslavia was its colloquial name from the very beginning. On the 7 of April 1941, Yugoslavia fell prey to Nazi occupation and was reorganised into four provinces under foreign policy; the original provincial boundaries were restored in 1945, in addition with the seizing of territory from Italy.