Dissolution of Czechoslovakia
Since the federalization in 1968, Czechoslovakia had divided citizenship, either of the Czech Socialist Republic or of the Slovak Socialist Republic (the word 'Socialist' was dropped from both names shortly after the Velvet Revolution). This distinction, however, had little effect on the citizen's life. On January 1, 1993, all Czechoslovak citizens automatically became citizens either of the Czech Republic or the Slovak Republic, based on their previous citizenship, permanent residence address, birthplace, family ties, job, and other criteria. Additionally, people had one year's time to claim the other citizenship under certain conditions.
Czech Republic
Despite the mobilization of 1.2 million-strong Czechoslovak army and the Franco-Czech military alliance, Poland annexed the Zaolzie area around Český Těšín; Hungary gained parts of Slovakia and the Subcarpathian Rus as a result of the First Vienna Award in November 1938. The remainders of Slovakia and the Subcarpathian Rus gained greater autonomy, with the state renamed to "Czecho-Slovakia". After Nazi Germany threatened to annex part of Slovakia, allowing the remaining regions to be partitioned by Hungary and Poland, Slovakia chose to maintain its national and territorial integrity, seceding from Czecho-Slovakia in March 1939, and allying itself, as demanded by Germany, with Hitler's coalition.