Question

Which of these events was MOST responsible for Senator Joseph McCarthy's concern about the spread of Communism after World War II?

Answer 1

It was the rise of Mao Zedong and Communism in China.  McCarthy blamed the Marshall Plan for this development.  Marshall at the time was involved in building foreign policy with China.  This gave McCarthy reason to place the blame on him.  

Answer 2

Answer

The rise of Mao Zedong

Explanation:

The victory of the Chinese Communist Revolution, as well as the Korean War, were both view by some as failures of U.S. foreign policy. The Berlin Wall and Cuban Missile Crisis happened. McCarthy's wild and reckless charges, while the Russian Revolution took place three decades prior.