9/11 was not an inside job. I think it's possible, though not probable, that the government may have had some prior knowledge of the attacks. The government capitalized upon the attacks, with massive fear campaigns to strengthen the central state. Also, there are many shady things involved in the entire affair, such as with Bush refusing to present evidence to the Taliban when they were willing to turn bin Laden over.
Pearl Harbor was not an inside job. However, FDR knew of an imminent attack somewhere in the Pacific / West Cost and was planning on using the attack to justify entering the War. The government capitalized upon the attacks, with massive fear campaigns to strengthen the central state.
The Gulf of Tonkin was a massive propaganda event. The government capitalized upon the 'attacks', with massive fear campaigns to strengthen the central state.
During WWI and WWII, both England and Germany carried on massive propaganda campaigns full of lies to try to get others to join their respective sides. The governments capitalized upon the lies, with massive fear campaigns to strengthen the central state.