Who was primarily responsibile for the cold war US or soviet union?

The Cold War was primarily driven by a combination of factors from both the United States and the Soviet Union, making it difficult to assign sole responsibility to either side. The U.S. aimed to contain communism and promote capitalism and democracy, while the Soviet Union sought to expand its influence and support communist movements globally. Key events, such as the Truman Doctrine and the Marshall Plan from the U.S., and the establishment of the Eastern Bloc by the Soviets, heightened tensions. Ultimately, both nations contributed to the conflict through their ideologies, actions, and mutual distrust.