Which long-term change did the American Revolution bring to what is now the United
States?

The Revolution opened new markets and new trade relationships. The Americans' victory also opened the western territories for invasion and settlement, which created new domestic markets. Americans began to create their own manufacturers, no longer content to reply to those in Britain.

Explanation:

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i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

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it was the first amendment