Factors help to explain why the US and the Soviet union became rivals instead of allies?

The US and the Soviet Union became rivals instead of allies due to fundamental ideological differences, with the US advocating for capitalism and democracy while the Soviet Union promoted communism and a centralized economy. The aftermath of World War II led to power struggles in Europe and differing visions for post-war reconstruction, further escalating tensions. Additionally, mutual distrust and the arms race, exemplified by the development of nuclear weapons, reinforced their adversarial relationship, culminating in the Cold War. These factors combined to create a hostile rivalry that shaped global politics for decades.