I don't think it was a conspiracy by the American government, but I do think it could have been prevented...yet it still happened. If you watch video feed on youtube, you will notice that some of the planes crashing into the tower's are military aircraft. How do terrorist steal American Military aircraft vehicles and get away? How do they have time to take off? I think someone helped on the inside and thought it would be a good idea to start a war.
In other words, I think they were like "Oh they want to start a war, why not?" and thought it would help or we would have advantage. Yet it ruined our economy for many decades.
That's just my opinion.
Military aircraft? Where? Theres video of it clearly showing passenger aircraft. The passenger aircraft that are siad to have crashed that daya re unaccounted for. And there are tens of thousands of eye witness reports that say they say a passenger plane. So the idea that it was a military plane is outrageous.