Republic of Slovenia
Historically, the current territory of Slovenia has formed part of many different states, including the Roman Empire, Byzantine Empire, Carolingian Empire, and the Holy Roman Empire, the Habsburg Monarchy, the Republic of Venice, the French-administered Illyrian Provinces of the First French Empire of Napoleon I, the Austrian Empire and Austro-Hungarian Empire. In December 1918 they merged with the Kingdom of Serbia into the Kingdom of Serbs, Croats and Slovenes (renamed the Kingdom of Yugoslavia in 1929). In 1945 Slovenia became a founding member of the Federal People's Republic of Yugoslavia, renamed in 1963 as the Socialist Federal Republic of Yugoslavia. In June 1991, after the introduction of multi-party representative democracy, Slovenia became the first republic that split from Yugoslavia and became an independent sovereign state. In 2004, it entered the European Union.