What significant event prompted the U.S. to launch military action in Afghanistan?

Question

The 9/11 terrorist attacks

The collapse of the Soviet Union

The Gulf War

Answer 1

The significant event that prompted the U.S. to launch military action in Afghanistan was the 9/11 terrorist attacks. These attacks, carried out by the terrorist group al-Qaeda on September 11, 2001, led to the U.S. initiating military operations in Afghanistan to dismantle al-Qaeda and remove the Taliban regime that was providing them shelter.