Answer:
The causes of the beginning of the Cold War between the US and the USSR from 1945 to 1950 can be attributed to several key factors, including the ideological differences between the two nations, the mistrust and fear of each other's motives, the struggle for power and influence in the post-World War II world, and the arms race. The US, being a capitalist democracy, was at odds with the Soviet Union's communist ideology and believed that the spread of communism posed a threat to its way of life. On the other hand, the USSR was wary of the US's intentions, given its history of imperialism and intervention in other countries' affairs. As the two superpowers jostled for influence in the aftermath of World War II, the creation of military alliances and the acquisition of nuclear weapons only added to the tensions. The events of the Berlin Blockade and the creation of the North Atlantic Treaty Organization (NATO) also contributed to the start of the Cold War.