See a column by Peter Zeihan at his eponymous website, Zeihan on Geopolitics. Let me share with you a favorite bit.
If not for the seemingly bottomless volume of TrumpDrama in America these days, most Americans would probably be sighing in relief right now. If the Americans really don’t have an interest in maintaining a global Order, then the Middle East is barren of American national interests and it can now firmly be someone else’s problem. It isn’t nice. It isn’t responsible. It won’t be pretty. But that doesn’t mean it isn’t true.Many Washington foreign policy wonks are personally invested in the U.S. role as world policeman. Trump is not. He will probably only send significant U.S. forces to non-NATO places that will "hire" them, pick up their tab. You might want to read Zeihan’s column.