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
Agreement on Friendship and Cooperation between Bosnia and Herzegovina and Croatia in the party between Croats from ethnically mixed areas of central and northern Bosnia and those from Herzegovina. Milivoj Gagro, prewar Croat mayor of Mostar and ally of Kljuić said: "The secessionist policy [union with Croatia] was consistently supported by the Herzegovina side, not by Sarajevo, Posavina, or Central Bosnia Croats. [...] Croats from Central Bosnia and Posavina, as well as those from urban centers who lived with Muslims and Serbs, thought differently. But when the war picked up, Posavina Croats were attacked, Sarajevo was surrounded [...] Kljuić was sidelined and Boban came in with idea [the Croat separatist idea]