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 nationalism
In 1990–1992 during transformation of Czechoslovakia into liberal market economy, due to disputes on shape of Czechoslovak federation, Slovak national aspirations strengthened and one of the reasons for final dissolution of Czechoslovakia in 1992 were with the Slovak nationalism also Czech economic nationalism, for not to fund not so developed Slovak economy. Czech Republic became independent on 1 January 1993.