Nixon’s plan to end the Vietnam War through the strategy of Vietnamization proved successful within a surprisingly short period of time.
did not appease most American citizens.
assured his election as president in 1968.
struck most Americans as the most sensible strategy.

did not appease most American citizens.

Explanation:

In order to bring an end to the intervention of the United States in Vietnam War, the policy of Vietnamization was adopted by Richard Nixon. The policy included the increase in the combat sources and enhancement of the South Vietnamese forces. It also included  to adopt the methods of decreasing the number of troops from Unites States. The role of United States was controlled to the extent of providing only cooperation and not of the administrative one.