Key Historical Events. The original Croats migrated to their present territory in the 6th century and were converted to Roman Catholicism. Croatia was united with Hungary by a personal union of thrones in 1091 and remained under Hungarian administration until the end of the first world war. On 1 Dec. 1918 Croatia became a part of the new Kingdom of Serbs, Croats and Slovenes, which was renamed Yugoslavia in 1929.
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