A political philosophy or ideology opposed to the union of separate states or groups into a confederation.
From anti- (against) + confederationism (from Latin confederatus, joined by oath together, + -ism, a system or belief). This term emerged prominently in 18th-19th century American and European political discourse when federalism was debated as a form of government.
During the American founding era, people like Patrick Henry argued against the Constitution from an anticonfederationism stance—they believed states should stay independent rather than join a federal union, and these ideas shaped real history.
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