America's view in the Vietnam was fear. Fear drove them to participate in the war. Why fear? They were afraid Vietnam would become communist because if they became communist they would support or have the support from the Soviets. If this were to happen Vietnam could've became a missile launching spot for the soviets if America wouldn't have participated.
It's my best explanation from what I remember and from what I think. Hope it's helpful to you.
I'd say they developed in river valleys (2).
Answer:
America wanted France as an ally in its Cod War effort to contain the Soviet Union. Truman believed that if he supported Vietnamese independence, he would weaken anticommunist forces in France. To ensure French support in the Cold war, Truman agreed to aid France's efforts to regain control over Vietnam
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