Follow the money. There was a time Iraq currency was worth three times more than the dollar before shiet got fucked up real quick.
This is how it starts
Americans aren't interested in winning but keeping their arms manufacturers in business. The longer the war means more business for their arms manufactures, the likes of Lockheen Martin and BAEs systems. That's why Trump is busy forcing countries like Turkey to buy their weapons And who cares, the war is not in their soil.