Why did america have such a problem with communism? Its just another country's ideology or was america trying to do a crusade for democracy?
To answer your question, the reason why America is afraid of communism is because the USSR posed an existential threat to us. We're one of the few places in the world where we haven't had a major conflict/war on our own territory in a very long time (for hundreds of years if you don't count Pearl Harbor). So when the USSR started racking up nukes and rivaling our military, a vast majority of the US was terrified of fiery, nuclear destruction. In retrospect, young people today see the Cold War as a part of history and don't have the same kind of reactionary fear of commies that old people do.