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.
Czech and Slovak Federative Republic
After the fall of communism in 1989, Czechoslovakia adopted the official name Czech and Slovak Federative Republic (, ; ČSFR) during the period from 23 April 1990 until 31 December 1992, when the country was dissolved into the Czech Republic and Slovakia. This period is also referred to as the Fifth Czechoslovak Republic.