Slovakia at the UEFA European Championship
As Slovakia along with the Czech Republic is considered to be the successor team of Czechoslovakia by FIFA and UEFA, they have qualified for a UEFA European Championship six times; three as Czechoslovakia and three as an independent nation since the dissolution of Czechoslovakia and its national team in 1993. As an independent nation, they directly qualified in 2016 after finishing second in their qualifying group.
Source: Wikipedia — Slovakia at the UEFA European Championship (CC BY-SA 4.0)