Lest we forget, it is not America's fault.
It is 99% due to the hapless performance of Iraq's previous Prime Minister.
Iraq was given a chance to be a reasonably stable nation. But Al Maliki decided to promote Shia interests at the expense of Sunni ones. And so, naturally, he lost support in the Sunni areas of Iraq.
This buffoon ruined the opportunity. And that gave Isis its chance to control Sunni sand.
Isis won't last as a territorial power. But its seizure of wealth is going to provide another decade of terrorism for everyone to share. Wonderful. Thanks, Maliki.