There are numerous differences between a dictatorship and a democracy. One difference is that in a dictatorship the leader has absolute authority while in a democracy the power of government is left up to the people. Another difference is that in a dictatorship leaders are very oppressive towards their citizens. If the citizens are unhappy with government and stand up against it then they are met with force. In a democracy, if the people are unhappy with their leaders they will replace the leader with a new one. A final example is that democratic government systems place checks on leaders to limit their power. In a dictatorship, there are no checks against the government. The dictator has unlimited power.
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To stop the spread of communist after World War II, the United States established a policy known as the Truman Doctrine.
A because besides the US felt close to the British since there ancestors and language, when Germany swept across Belgium it made the Americans feel sympathetic towards the allied powers.