Historical Events on December 20

11 significant historical events occurred on December 20. December 20 is a date that has seen several notable historical events. In 1942, during World War II, the Soviet Union launched Operation Mars, a significant military offensive. In 1952, the Convention on the Political Rights of Women was adopted, marking progress in international law. In 1956, the Montgomery bus boycott ended, marking a key moment in the civil rights movement. These events reflect the range of historical developments that have occurred on this date.