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.
Czechoslovak koruna
The Czechoslovak koruna (in Czech and Slovak: "Koruna československá", at times "Koruna česko-slovenská"; "koruna" means "crown") was the currency of Czechoslovakia from April 10, 1919, to March 14, 1939, and from November 1, 1945, to February 7, 1993. For a brief time in 1939 and again in 1993, it was also the currency in separate Czech and Slovak republics.