This was a policy that was meant to prevent the spread of communism. The United States enacted the policy of containment in at least two main ways. ... Thus, the US used military, political, and economic tools to try to prevent the spread of communism during the Cold War.
Either it's just "Soviet Union", or the "soviet union, the army had an advantage at Stalingrad".
Matthew Perry, and Frederick J Turner
The two largest Native American empire's were the Aztec of Mesoamerica and the Inca of South America.