There were several differences that separated the Soviet Union and the US after World War II.
1) The US had a democratic political system while the Soviet Union used a communist system- The communist system revolves around the government having significant control over the media, economy, and other facets of society. On the other hand, a democratic system gives people the power to pick their representatives.
2) The US favored capitalism while the Soviet Union favored a command economy. - The command economy resulted in the Soviet Union's central government telling businesses what they can and cannot produce. America's capitalist system allows competition between businesses and little government interference decide the direction of the US economy.
I believe the answer is: Immigrants were associated with anarchism and communism
During that period, united states was involved in the cold war against the Soviet Union. At that time, most people were scared that the agents from communist countries could come into united states through immigration process, which create the anti-immigration hysteria.
