Peter Van Buren
Peter is a 24 year veteran as a State Department diplomat and ended his service as leading an FOB ( forward operating base) during the Iraq war. The base was used to establish an American presence to spend millions on Iraqi community support. – Ed.
Going forward, Trump is unlikely to pull many troops out of Iraq, having seen the political price Obama paid for doing so in 2011. The troops will stay to block the worst of any really ugly Shia reprisals against the Sunnis, and to referee among the many disparate groups (Peshmerga, Yazidi, Turkmen, the Orwellian-named/Iranian-backed Popular Mobilization Forces, along with animated militias and factions of all flavors) who the U.S. armed willy-nilly to defeat ISIS.
The U.S. put a lot of weapons on to the battlefield and a reckoning is feared. The armed groups mostly set aside differences dating from Biblical times to fight ISIS, but with that behind them, about all they still have in common is mutual distrust. There is zero chance of any national cohesion, and zero chance of any meaningful power-sharing by Baghdad. U.S. goals include keeping a lid on things so no one back home starts looking for someone to blame in the next election cycle, wondering what went wrong, “Who lost Iraq?” and asking what we should be doing about it. How well the U.S. will do at keeping things in line, and the long term effects of so many disparate, heavily-armed groups rocketing around greater Mesopotamia, will need to be seen.
U.S. troops perma-stationed in Iraq will also be a handy bulwark against whatever happens next in Syria. In addition, Israel is likely to near-demand the United States garrison parts of western Iraq as a buffer against expanding Iranian power, and to keep Jordan from overreacting to the increased Iranian influence.
Iran has already passively agreed to most of this. It has little to gain from a fight over some desert real estate that it would probably lose to the Americans anyway, when their prize is the rest of Iraq. And if any of this does presage some future U.S. conflict with an Iran that has gotten “too powerful,” then we shall have witnessed a true ironic tragedy and a historic waste of American blood and resources.