What steps did the US take in response to the terrorist attacks on September 112001?

In response to the September 11, 2001 terrorist attacks, the U.S. launched a military campaign in Afghanistan to dismantle al-Qaeda and remove the Taliban regime that harbored them. The U.S. also implemented the USA PATRIOT Act to enhance domestic security and intelligence capabilities. Additionally, there was a significant increase in airport security and international cooperation in counterterrorism efforts. These actions marked a shift in U.S. foreign and domestic policy towards a more aggressive stance against terrorism.