The document examines the attitudes and motives that shaped hostility between the US and USSR at the start of the Cold War. It discusses how the US emerged from WWII as the world's leading nation economically and militarily with nuclear weapons. There were also fears of communism based on memories of the 1930s. Meanwhile, the USSR viewed its role in defeating Germany as proof communism had triumphed over fascism, and it sought to establish friendly governments in Eastern Europe as a buffer against future invasion. These opposing viewpoints and priorities increased tensions between the two former allies.