The global war on terror began when Congress formally declared war on Afghanistan in 2001.

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The global war on terror began with the United States launching military operations in response to the September 11 attacks, but Congress did not formally declare war on Afghanistan. Instead, Congress passed the Authorization for Use of Military Force (AUMF) against those responsible for the attacks, which allowed the use of military force without a formal declaration of war.

The Global War on Terror Began When Congress Formally Declared