Yugoslav history began in the early 20th century when the Kingdom of Serbs, Croats, and Slovenes was formed in 1918 after World War I. This kingdom later became known as Yugoslavia in 1929. The country was a multi-ethnic state, comprising several nations, including Serbs, Croats, and Slovenes, and faced various political challenges throughout its existence. During World War II, Yugoslavia was invaded and occupied by Axis powers, leading to a resistance movement led by Josip Broz Tito. After the war, Tito established a socialist federation, which lasted until his death in 1980. The 1990s saw the breakup of Yugoslavia into several independent countries, resulting in conflicts and significant political changes in the region.