The Kingdom of Yugoslavia, which before 3 October 1929 was known as the Kingdom of Serbs, Croats and Slovenes was established on 1 December 1918 by the union of the State of Slovenes, Croats and Serbs and the Kingdom of Serbia (the Kingdom of Montenegro was annexed on 13 November 1918, and the Conference of Ambassadors in Paris gave international recognition to the union on 13 July 1922). The Kingdom of Yugoslavia was invaded by the Axis powers in 1941. In 1943, Democratic Federal Yugoslavia was proclaimed by the Partisan resistance. In 1944, the king recognised it as the legitimate government, but in November 1945 the monarchy was abolished. Yugoslavia was renamed the Federal People's Republic of Yugoslavia in 1946, when a communist government was established. In 1963, it was renamed again to the Socialist Federal Republic of Yugoslavia (SFRY). This was the largest Yugoslav state, as Istria, Rijeka, and Zadar were added to the new Yugoslavia after the end of World War II.