Croats of Bosnia and Herzegovina Dalmatian Croatia formed a united Croatian kingdom, which included Dalmatia and part of Bosnia and Herzegovina, Pannonia (eastern Slavonia and northeastern Bosnia), and Savia (western Slavonia). In 1102 Croatia entered into a union with the Kingdom of Hungary. After this, Bosnia, which was earlier part of the Kingdom of Croatia, started to disassociate with Croatia. At first, Bosnia became a separate principality under Ban Kulin who managed to solidify Bosnian autonomy at the expense of more powerful neighbours, but only in the 14th century did Bosnia become a formidable state. In the 14th century, King Tvrtko I conquered part of
Partition of Bosnia and Herzegovina it was internally divided into six oblasts of the Kingdom of Serbs, Croats and Slovenes. In 1929, the oblasts were replaced with four Banovinas of the Kingdom of Yugoslavia, but all of them also included regions outside of Bosnia and Herzegovina. The Cvetković-Maček agreement that created the Banovina of Croatia in 1939 encouraged what was essentially a partition of Bosnia between Croatia and Serbia. The agreement angered Bosniaks, then known as Yugoslav Muslims, including the Yugoslav Muslim Organization (JMO) that denounced the agreement's partition of Bosnia and Herzegovina. During the Bosnian War, it was proposed that BiH be divided into