Primary Goal of U.S. Involvement in Vietnam War

After World War II, the United States became involved in a conflict in Southeast Asia that escalated into a major military engagement known as the Vietnam War. This conflict was rooted in the struggle between the communist government of North Vietnam and the non-communist government of South Vietnam, which was supported by the United States. The Vietnam War led to significant social and political changes in the U.S., including shifts in public opinion about government actions and military involvement abroad.

Which of the following best describes the primary goal of U.S. involvement in the Vietnam War?