Lincoln successfully guided the country through it's most difficult period, The Civil War
Intermediate-Range Nuclear Forces Treaty
The United States wasn't a part of it and the countries that were a part of it didn't take the idea of collective security seriously. When countries attacked others nothing was done.
Answer: Not only was the Soviet Union communist, they were totalitarian, meaning all the power was with the rulers. The United States was capitalist which meant that people could own land and businesses and compete for themselves. This led to a stark contrast between poor and rich.
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