The war had nothing to do with ISIS as dick hurtz seems to imply, but instead, as Barrack said, the war was based on Bush's accusations that Iraq possessed weapons of mass destruction and that Iraq was somehow tied to the 9/11 attacks, both of which were not supported by evidence, and so many countries refused to participate in the war. The war overthrew a secular leader who kept his country stable albeit oppressed, and replaced him with a religious fanatic. As the arab spring has demonstrated in almost all countries in which it occurred, a secular dictator is better than a religious fanatic who divides the country, especially in the case of Islamic countries which tend to contain Shiites and Sunnis, which often conflict with one another. In short the war in Iraq was a war crime and it resulted in instability in the country, and the united states government should stop trying to overthrow secular leaders, including Assad.