11. why did the united states support france in vietnam? a. the united states needed french approval for a trade agreement. b. the united states supported france's claim to a colonial empire. c. the united states needed french support in western europe. d. the united states was honoring an old agreement with france.

The answer is: C. The United States needed French support in Western Europe.

The reason is: They viewed the conflict as a colonial war and a continuation of the First Indochina War against forces from France and later on the United States. The U.S. government viewed its involvement in the war as a way to prevent a communist takeover of South Vietnam.

Hope that helps! :)

Marshall plan is the answer.