9/11 was also a excuse for invading Iraq. It was supposedly the Taliban and Afghanistan responsible for 9/11 but yet Rumsfeld proclaimed it was Iraq and we had to take action immediately. 

Meanwhile a year or two prior to the 9/11 attacks, the Taliban, scorched and destroyed 90% of all the poppy fields. (key ingredient in heroin). What happened after the US invaded Afghanistan in 2001? Growth of poppies restored.

By 2003 we had drummed up enough anti-muslim sentiment through the american cheerleader news to also invade Iraq on the suspicion of Biological Weapons. None were ever found.