Slovakia
The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group. Slovakia became a member of NATO on 29 March 2004 and of the European Union on 1 May 2004. On 1 January 2009, Slovakia adopted the Euro as its national currency.
Second Czechoslovak Republic
The Czechoslovak Republic was dissolved when Germany invaded it on 15 March 1939 and annexed the Czech region into the Protectorate of Bohemia and Moravia. On the same day as the German occupation, the President of Czechoslovakia, Emil Hácha was appointed by the German government as the State President of the Protectorate of Bohemia and Moravia which he held throughout the war.