Slovakia was a country in Europe.
Slovakia broke away from Czechoslovakia at some point in the 1990s, as did the Czech Republic, (PROSE: The King of Terror) after the communist government was overthrown. (COMIC: The Broken Man)
The Czech Republic and Slovakia were still separate countries as late as the 22nd century. (PROSE: Life from Lifelessness)
In the 23rd century, Slovakia and Czechia were again united as the Third Czech and Slovak Republic. (PROSE: Spoilsport)