There were 6 countries under the Marshall Plan, England, France, Germany, Italy, Poland, and Belgium. The Marshall Plan had one primary goal and that was to rebuild the economics and spirits of Europe. The U.S. sent them shipments of food, staples, fuel, and machinery.
The start of the Arms Race between the United States and the Soviet Union was due to the Soviet Union testing their first bomb. There was then a threat of nuclear destruction and the people were shocked. They didn't know that the Soviet Union was that far along in their development.
The cause of the Second Red Scare was due to the spread of communism. Joe McCarthy, the senator, played a role in this because he was determined to out the communists.