Authorization for Use of Military Force Against Terrorists facts for kids
The authorization granted the President the authority to use all "necessary and appropriate force" against those whom he determined "planned, authorized, committed or aided" the September 11th attacks, or who harbored said persons or groups. The AUMF was signed by President George W. Bush on September 18, 2001.
Authorization for Use of Military Force Against Terrorists Facts for Kids. Kiddle Encyclopedia.