How did John Adams assist George Washington after the American Revolution ended?

In the 1780s, Adams served as a diplomat in Europe and helped negotiate the Treaty of Paris (1783), which officially ended the American Revolutionary War (1775-83).

Explanation:

Adams greatly respected Washington and in 1775 pushed for Congress to name him the head of the army Adams believed that with Washington in command This Appointment will have a great Effect in cementing and securing the Union of these Colonies

Explanation:

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the telephone is the answer