Demographic history of Bosnia and Herzegovina of Catholic preachers. Preottoman Catholic population had a great share in the emigrations from Bosnia and Herzegovina. The emigration flows were directed towards Dalmatia, Croatia, Slavonia, Baranja and north-west Bačka. The western part of today's region of Bosnia, today known as Bosnian Krajina, was taken by the Ottomans in the 16th century, and was for some time still known as "Turkish Croatia", as its once overwhelming Catholic and Croat majority disappeared and the Ottomans entrenched the new border along the Sava and Una rivers. After more than a century of military losses, the Habsburg Empire waged some victorious wars against
Croats of Bosnia and Herzegovina and Fojnica. Around 30% of the present-day territory of Bosnia and Herzegovina become part of Banovina of Croatia. Those parts had a Croatian majority. Creation of Banovina of Croatia was one of the solutions to the ""Croatian issue"". After the collapse of Yugoslavia amidst German and Italian invasion in April 1941, the Axis puppet state which encompassed the entire Bosnia and Herzegovina, Independent State of Croatia (NDH) under the radical Croat nationalist ustaša regime was established. Bosnian Croats were divided, as some supported NDH, some actively opposed it by joining or supporting the Yugoslav Partisans, while others chose to wait,