At first, American shipping was almost defenseless against French privateers, but by 1800 armed merchantmen and U.S. warships were clearing the sea-lanes. Despite several brilliant naval victories, war fever subsided. Word came to Adams that France also had no stomach for war and would receive an envoy with respect. Long negotiations ended the quasi war. Sending a peace mission to France brought the full fury of the Hamiltonians against Adams. In the campaign of 1800 the Republicans were united and effective, the Federalists badly divided. Nevertheless, Adams polled only a few less electoral votes than Jefferson, who became President. On November 1, 1800, just before the election, Adams arrived in the new Capital City to take up his residence in the White House. On his second evening in its damp, unfinished rooms, he wrote his wife, "Before I end my letter, I pray Heaven to bestow the best of Blessings on this House and all that shall hereafter inhabit it. May none but honest and wise Men ever rule under this roof."

Adams retired to his farm in Quincy. Here he penned his elaborate letters to Thomas Jefferson. Here on July 4, 1826, he whispered his last words: "Thomas Jefferson survives." But Jefferson had died at Monticello a few hours earlier. .