Powers out of Kosovo. Following World War I, the Kingdom of the Serbs, Croats and Slovenes was formed, shortly after retaking Kosovo, capturing Vojvodina from Austria-Hungary, and unifying with Montenegro to form a larger Kingdom of Serbia. Kingdom of Yugoslavia (1918–1941) The peace treaties of 1919–1920 established a Yugoslav state named "The Kingdom of Slovenes, Croats and Serbs", also called "Yugoslavia". The Kingdom comprised 12 million people, 300,000 were Albanian. Kosovo was split into four counties – three being a part of the entity of Serbia: Zvečan, Kosovo and southern Metohija; and one of Montenegro: northern Metohija. However, the new administration system since 26 April 1922 split Kosovo among three Areas of the Kingdom: Kosovo, Rascia and Zeta. In 1929, the Kingdom was transformed into the Kingdom of Yugoslavia. The territories of Kosovo were split among the Banate of Zeta, the Banate of Morava and the Banate of Vardar. By 1921 Albanian Kosovars asked the League of Nations to unite Kosovo with Albania. They alleged 12,000 Albanians had been killed and 22,000 imprisoned since 1918. A Kachak movement of armed Albanians seeking union with Albania developed. The government considered this subversive to the Yugoslav constitution. Colonisation of Kosovo was a state project implemented by the Kingdom of Yugoslavia during the interwar period. During this colonisation, 60,000–65,000 people settled in Kosovo colonists. Over 90% of the total number of colonists were Serbs (including Montenegrins). Parallel with the colonization, the country carried out forced migration of Albanians from Kosovo. During the period 1918–1941 90,000 to 150,000 Albanians and other Muslims emigrated from Kosovo. In 1919, Yugoslav forces slaughtered 600 Albanian women and children in the district of Gusinje. World War II Yugoslavia was conquered by the Axis in April 1941 and divided mainly between Italy and Germany. Kosovo was included mainly in the Italian controlled area and was united to fascist Albania between 1941 and 1943. After the Axis invasion, the greatest part of Kosovo became a part of Italian-controlled Greater Albania, and a smaller, Eastern part by the Bulgarian and Nazi-German-occupied Serbia. Since the Italian occupied Albanian political leadership had decided in the Conference of Bujan that Kosovo would remain a part of Albania, they started expelling and killing the Serbian and Montenegrin populations. Mustafa Kruja, the then-Prime Minister of Albania, was in Kosovo in June 1942, and at a meeting with the Albanian leaders of Kosovo, he said: "We should