The government allowed the Luscitania to enter German patrolled waters and get torpedoed, causing the public to get behind declaring World War. Just when the economy was starting collapse.
The government allowed Japanese planes to get close enough to bomb Pearl Harbour, to achieve the same ends and save the country from continued economic stagnation.
The government - namely the Neocon movement within the Bush government - was actively looking for 'A new Pear Harbour' in official documentation, which is a matter of public record.
I am 100% convinced the government - and the people who control each successive government - is responsible for 9/11.