What was one result of the communist takeover of mainland china in 1949? a. the united states was forced to allow the new government to join the united nations. b. many people in the united states were convinced that the policy of containment had failed. c. the united states and the united nations began to plan an invasion of the new nation. d. many people in the united states felt that foreign policy should be changed to support containment.

(D) Many people in the U.S. felt that foreign policy should be changed to support containment

In 1949, after the end of WWII, the Soviet Union was growing strong, and many war-torn nations were open to the idea of communism to rebuild. At the time, China had been in a civil war between the Chinese Communist Party (CCP) led by Mao Zedong, and the Nationalist Party. As corruption, continuing distrust and lessening support in the Nationalist Party rose, it led to Zedong and the CCP's victory in China.

This, and the communist revolutions or other nations led the U.S. to start a containment campaign of communism, and eventually led to the Cold War, and the sour relations between the U.S. and Russia, as both tried to convert nations to their forms of government (U.S. - Democracy / Russia - Communism)

d. japan's attack on pearl harbor