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.
Poland–Slovakia border
When the Republic of Slovakia was established on March 14, 1939 (officially independent, but controlled by Nazi Germany), the Polish-Czechoslovak border ceased to exist, which became part of the Polish-Czech border (with the Protectorate of Bohemia and Moravia), the Polish border. Slovak and Polish-Hungarian border.