[xorcist]

"Military action", perhaps, but that is a very vague term. You replied to someone about "fighting foreign troops on own soil" which describes a ground invasion. 9/11 was something else.

It is USA did not respond with any military force. The response, if any, was behind closed doors and we may never know the details. The only thing we know is that relationships with the Saudis are closer than ever. Journalists aren't even allowed to question why they chop up their regime critics in small pieces and put them in a box because that is considered "impolite".

The public response was largely within domestic policy. New laws, new government agencies, more money spent on the military. It was also alluded to when fighting the continuation war with Iraq, but nothing was ever said explicitly about that.