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 Socialist Republic
The Czech Socialist Republic ("Česká socialistická republika" in Czech; abbreviated ČSR) was a republic within the Czechoslovak Socialist Republic that is now the independent Czech Republic. The name was used from 1 January 1969 to March 1990.