1939–40 Yugoslav Football Championship
In 1939, as the Second World War began in parts of Europe, Croatian and Slovenian clubs began leaving the Football Association of Yugoslavia and joining the Croatian Football Federation, in protest of the supposed sports' centralization among Serbs in Belgrade.The top three clubs from each league will qualify for the final stage of the Yugoslav Championship.BSK, Slavija and Jugoslavija qualified through the Serbian one, while Građanski, Hajduk and HAŠK through the Croatian-Slovenian.Having been invaded by the Axis Powers on April 6, 1941, the Kingdom of Yugoslavia was dismembered and this would be the last Yugoslav Championship.Instead, the 1940–41 Croatian First League became the national championship of the newly created Nazi puppet state Independent State of Croatia (NDH), which enjoyed peace per se as an Axis member and continued to hold national competitions until 1944, while the Serbian Football League became the national championship of the occupied Serbia.