What caused isis terrorists to take over Iraq

Instability in Iraq

Explanation:

ISIS faded away for a few years due to US troops surging Iraq in 2007. But it began to reemerge again, and they took advantage of the severe unstability of the Iraqi government, as just a few years ago Sadam Hussein was killed. It wasn't the Iraqi "government" that was in control, it was ISIS. It was just in name, as further instability was inflicted upon due to ISIS control.

it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.