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
History of Bosnia and Herzegovina Croatia and Serbia in the mid 19th century, and was too well-entrenched to allow for the widespread acceptance of a parallel idea of Bosnian nationhood. By the latter half of the 1910s, nationalism was an integral factor of Bosnian politics, with national political parties corresponding to the three groups dominating elections. The idea of a unified South Slavic state (typically expected to be spearheaded by independent Serbia) became a popular political ideology in the region at this time, including in Bosnia and Herzegovina. The Austro-Hungarian government's decision to formally annex Bosnia-Herzegovina in 1908 (the Bosnian Crisis) added to a sense