The war between North and South Vietnam did not end when the United States pulled out in March 1973. In fact, it was not long before North and South Vietnam were fighting again. President Thieu had little hope of defeating the north without help. He was not a popular leader, and he was forced to use the south's military troops to keep him in power instead of using them to fight the Communists. Thieu expected that the United States would help him continue the war against North Vietnam, but Americans were tired of war. Once all the troops were home, most did not care about what happened in Southeast Asia. Congress passed the War Powers Act in November 1973, which prohibited the president from committing U.S. troops without congressional approval. In addition, Congress passed another law that prevented U...