Doesn't matter that much. A disruption of the Gulf's flow would still cause every single producer and importer out there to change where they route the product, and the price spike would affect affairs stateside.
That is why the Carter Doctrine has never been withdrawn.
Oil also goes to our partners in Europe and around the world. The goal isn't just having oil for the United States, but a stable world economy. George HW Bush & Co didn't want be at the behest of one or a few despotic leaders that could disrupt the flow of both oil and the world economy. They/we need heads of state dependent on the global monetary system--so that the decisions they make can be controlled. That's the idea. And at what costs is our day's number one dilemma??
That is why the Carter Doctrine has never been withdrawn.