PATRIOT, n. One to whom the interests of a part seem superior to those of the whole. The dupe of statesmen and the tool of conquerors.

Ambrose Bierce (1842–1914?) American writer and journalist
“Patriot,” The Devil’s Dictionary (1911)
    (Source)

Originally published in the "Cynic's Word Book" column in the New York American (1904-12-26) and the "Cynic's Dictionary" column in the San Francisco Examiner (1904-01-03).

Those newspaper versions also included:

A person whose zeal for the defense of his country’s altars and fires is not inconsistent with a fierce desire to cross the border to overturn the altars and extinguish the fires of another land.

See Bierce's definition of "Patriotism."