Answer:
B. increasing trade with the Soviet Union
Explanation:
Nixon reoriented foreign policy away from containment and towards détente with both the Soviet Union and China, seeking to alienate them. The policy of the detente with China is still today the basic policy in the 21st century, while the Russians rejected the detente and used the American tolerance to expand their operations widely in Latin America, Asia and Africa. Both Russia and China tolerated US policy in Vietnam, abandoning their once-allied North Vietnam. Nixon promoted the "Vietnamization", with which the army of South Vietnam would be greatly improved so that the US forces they could retire. The combat troops left in 1971 and Nixon was able to announce a peace treaty in 1973. His promises to Saigon, that he would intervene if North Vietnam attacked were valid in 1972, but lost all value when he resigned in 1974. A Despite having a thorough army, South Vietnam was very corrupt and lacked self-confidence enough to effectively resist the invasion of North Vietnam, and Saigon was defeated by the North in 1975, ending the war.
