Who came to the aid of the colonists and why was this help important?

Most historians agree that without outside help the colonists likely would not have won the war. The assistance by France especially was crucial in putting an end to the war. Interesting Facts about American Allies in the Revolutionary War Benjamin Franklin served as the ambassador to France during the war.

France

Explanation:

Because they provided the money, troops, armament, military leadership, and naval support that tipped the balance of military power in favor of the United States

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for your question the answer would have to be france