Not just Hussein but the entire Arab Spring. Heck, the US is still trying to topple Assad although it's blindingly obvious that doing so will only strengthen ISIS in Syria.

The problem with US foreign politics is that in the face of it they seem entirely ignorant of how their actions appear to the rest of the world (and what it might mean to their interests and how they would react to that).

EDIT: To clarify, I'm not saying the US was responsible for the entire Arab spring, but the Arab Spring and the mess it caused (when the initial euphoria had ended) are part of the fallout from the wars in Afghanistan and Iraq.