As a diplomat he helped negotiate a peace treaty with Great Britain and secured vital governmental loans. Adams was the primary author of the Massachusetts Constitution in 1780, which influenced the United States Constitution, as did his essay Thoughts on Government.

Adams was elected to two terms as vice president under President George Washington and was elected as the United States' second president in 1796. He was the only president elected under the banner of the Federalist Party. Adams's term was dominated by the issue of the French Revolutionary Wars, and his insistence on American neutrality led to fierce criticism from both the Jeffersonian Republicans and from some in his own party, led by his rival Alexander Hamilton. Adams signed the controversial Alien and Sedition Acts, and built up the Army and Navy in the undeclared naval war with France. He was the first president to reside in the White House.