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.
Celtic coinage
The Boii gave their name to Bohemia and Bologna; a Celtic coin (Biatec) from Bratislava's mint is displayed on Slovak 5 koruna coin, which was in use until Slovakia joined the euro zone on January 1, 2009.