@Baldimo,
Yes, and that was Obama's plan, to bring the troops home. The agreement was already signed to leave by 2011, we abided by it and the Iraqi Government wanted us to leave as well.
Only problem was, the "nation-building" program Bush spent all his time on turned out to be a sham. Mosul was "defended" by 30,000 Iraqi troops who lost the city to 600 ISIS fighters. Obviously, the Iraqi Army was a mirage, they just dropped their weapons and bolted. Iraq
looked like it was under control under Bush, but it really wasn't. Now Obama is doing the hard work of throwing ISIS out.