What is the name of the former country that was succeeded by countries such as Serbia, Croatia and Slovenia?

The former country that was succeeded by countries such as Serbia, Croatia, and Slovenia is called Yugoslavia. Yugoslavia was a socialist federation formed after World War II, comprising six republics: Serbia, Croatia, Slovenia, Bosnia and Herzegovina, Montenegro, and Macedonia. The country existed from 1945 until its dissolution in the early 1990s due to ethnic and political tensions which ultimately led to the creation of independent successor states.