Why did leaders in the United States believe that communism posed a threat to democratic nations?

The United States government was initially hostile to the Soviet leaders for taking Russia out of World War I and was opposed to a state ideologically based on communism. However, the Soviet stance on human rights and its invasion of Afghanistan in 1979 created new tensions between the two countries

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

whose power in the senate is equal to the power of the speaker of the house?