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.
Austro-Hungarian krone
In Czechoslovakia the currency was superseded by the koruna, at par. The names of the present-day "koruna" and "haléř" (in the Czech Republic) and the pre-Euro "koruna" and "halier" (in Slovakia) are derived from the Austro-Hungarian Krone and Heller.