 In October 1918, Syrmia, Vojvodina and the Kingdom of Montenegro unite with Serbia, and finally, in November, the State of Slovenes, Croats and Serbs, a shortly lived state formed by the South Slavic inhabited territories of the now dismembered Austro-Hungary, joins as well.The Kingdom of Serbs, Croats and Slovenes is proclaimed in Belgrade under the Karađorđević dynasty and is considered a legal successor of the Kingdom of Serbia.This new enlarged territory composing now different ethnicities and in which football presented different levels of development in different areas, presented a real challenge for a unified football championship to be organised.