Generations of Americans will have to pay the price for the decisions made.
No one sound really believed the 'case for war', but maybe there were other good reasons... like shifting the power base in the Middle East or somthing... but the countries that followed the US into invading Iraq (UK, Aust, Poland) must have done so to support America and to bolster their US alliances, not for the publically stated reasons for invading Iraq.
You can see that because Blair knew to 'sex up' intelligence reports, Howard never really repeated the worst parts of the Bush story so he couldn't be accused of lying, and Poland tried to keep their involvement a near secret.
So, I guess America can choose of that sort of decision making to continue, or they can vote for a change. Either way, I think the United States is the best thing to happen to the world in the past 1000 years and continues to do a lot to relieve poverty and environmental damage accross the world - but has still done more damage to the world than it should have politically, economically and environmentally in more recent history.