After Yugoslavia broke up in the early 1990s, it split up into the following countries: Slovenia, Croatia, Macedonia, Serbia, Bosnia and Herzegovina, and Montenegro. Montenegro and Serbia in particular joined together to form a single country also known as Yugoslavia, though this was not considered to be the "true" Yugoslavia by the international community. In 2003, that Yugoslavia was renamed to "Serbia and Montenegro", which existed until 2006 when it broke up peacefully into two separate nations.
Yugoslavia came into existence in 1918 after World War I, under the name of the "Kingdom of Serbs, Croats, and Slovenes". It was invaded by Nazi Germany and Italy in 1941, and split up and occupied by Germany and Italy during the rest of World War II. After the Axis powers were defeated and the war ended, Yugoslavia was re-established in 1945 as a socialist state.
Legacy and aftermath
In the early 1990s, the different regions of Yugoslavia broke up to become their own independent countries, although Serbia and Montenegro stayed together as a single country until 2006, when they too became independent states like the other countries of the former Yugoslavia.