evidence: Ruled by the Ottoman Empire from the 15th century, the region came under the control of Austria-Hungary in 1878 and subsequently played a key role in the outbreak of World War I. In 1918 it was incorporated into the newly created Kingdom of Serbs, Croats, and Slovenes, where it had no formal status of its own. After World War II it became a constituent republic of the Socialist Federal Republic of Yugoslavia. Following the disintegration of that state in 1991, the majority of the population of Bosnia and Herzegovina voted for independence in a 1992 referendum. Much of the country’s Serb population, however, opposed independence and boycotted the referendum.