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.
Second Czechoslovak Republic
In January 1939, negotiations between Germany and Poland broke down. Hitler scheduled an invasion of Bohemia and Moravia for the morning of 15 March. In the interim, he negotiated with the Slovak People's Party and with the Kingdom of Hungary and its representatives for the Hungarian minority in Slovakia to prepare the dismemberment of the Second Czechoslovak Republic before the invasion. On 13 March he invited Monsignore Jozef Tiso to Berlin, where he offered Tiso the option of proclaiming the Slovak state and seceding from Czecho-Slovakia. In such a case, Germany would be Slovakia's protector and would not allow the Hungarians to press on Slovakia any additional territorial demands. If the Slovaks declined, Germany would occupy Bohemia and Moravia and disinterest himself in Slovakia's fate—in effect, leaving the Slovaks to the mercies of the Hungarians and the Poles (Poland had claimed the Slovak Spiš territory since the Polish-Czechoslovak War). During the meeting, Joachim von Ribbentrop passed on a (false) report saying that Hungarian troops were approaching Slovak borders. Tiso refused to make such a decision himself, after which he was allowed by Hitler to organize a meeting of the Slovak parliament ("Diet of the Slovak Land"), which would approve Slovakia's independence.