1. The Soviet Union and the United States in World War II
Despite profound ideological clashes, the Soviet Union and the United States became unlikely allies to confront Nazi Germany and its allies during World War II. Their combined military and logistical efforts were pivotal in dismantling the Axis powers, particularly after Operation Barbarossa. Both sides collaborated, albeit uneasily, sharing intelligence and coordinating offensives. Their partnership shaped the outcome of the global conflict, though tensions resumed almost immediately afterward, leading to the Cold War. (history.state.gov)
