I believe the answer is the Industrial Revolution
After World War 2 had finished and the Cold War had slowly started to become more of a threat to those in the US the government decided to take action. In March of 1947 President Harry Truman decided to issue what was known as the loyalty order which stated that all federal employees needed to be checked to make sure they were actually loyal to the US government and not working for the Soviet Union. This effect had a title and was known as the Red Scare. In conclusion the US government were the ones responsible for initiating the anti communist crusade.
The correct answer here is the second option.
Debs was a Socialist Party member and one of the most prominent socialist political figures in the United States. He became a leader of the strikers in the Pullman Strike and was later convicted for disobeying court order. He proclaimed himself a socialist and ran for president of the United States as a socialist candidate numerous times. He opposed the US entry in the World War as he believed the reason for that was greed.
The answer is D I got a 100% on the unit review