How did Vietnam war affect the United States policy on containment ?

The domino theory was the basis for the United States strategy of containment and the reason for entering the Vietnam War. The Vietnam War was a result of the national strategy of containment. The national strategy of containment demanded the U.S. stop communist aggression into the countries of Southeast Asia.

Explanation:

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

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