What was 9/11 if not military actions on USA own soils? Like, sure it can be labelled terrorism rather than "conventional military intervention", but psyops apart, on practical level that’s typical asymmetric/guerrilla warfare.
"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.
it's indeed a distinction without a real difference, but terrorism is specifically targeted at civilians to produce some political outcome.
It's wild to suggest that terrorism against the US should not be responded with by military action - it's only the degree and targets that should be under debate.
This is foolish nonsense. An organized foreign army directing improvised missiles against your cities is very definitely conducting 'military action' and is a valid target for a military response.