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.
Czechoslovakia–Poland relations
Czechoslovakia gained independence in the aftermath of World War I, as Austria-Hungary fell apart, just as Poland regained independence as the Second Polish Republic after 123 years of partitions. Both emerging countries shared a long border, and soon became enveloped in a border conflict. Although it never developed into an open war, this conflict led to uneasy relations between both states in the interwar period.