Dissolution of Czechoslovakia
The Dissolution of Czechoslovakia (, ), which took effect on 1 January 1993, was an event that saw the self-determined split of the federal state of Czechoslovakia into the Czech Republic and Slovakia, entities that had arisen before as the "Czech Socialist Republic" and the "Slovak Socialist Republic" in 1969 within the framework of a federal republic.
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.