Besides the high-level members of the current administration, the American media was more complicit than anyone in promoting these false assumptions. They did little or nothing to expose the lies used to go to war until fully three years later. And they were cowed into line to parrot those lies, fearful for whatever reasons to actually stand up for what they believed and/or suspected to be right and truthful.
For my own part, I like to watch documentary films. I rented Uncovered: The War on Iraq (2004). This documentary was rife with high-level intelligence officers, some with 20 and even 30 years of experience, who refuted point by point each one of the fallacies used by the U.S. government to justify going to war.
Go ahead and rent this film and treat yourself to your own special anniversary celebration: http://www.truthuncovered.com/