I'm watching as our president proves his "leadership" capabilities on the world stage and had the thought that this might be the beginning of end of the US as a superpower and a return to the state of the world pre-Pax Americana.
As the US withdraws from the world (either by choice or forced to it by economic necessity), the void will not be left empty. I doubt one country will assert itself as dominant, but instead we will have the much more normal state of countries warring with one another and vying for control/conquest.
This will, of course, create tensions and uncertainties across the globe. The ever present threat of the United States stepping in if someone gets too disruptive has kept the world at peace. (Relative, we won't see true Peace while man rules.)
Once that peace is gone, so too will be the conditions that allow for "Just in Time" manufacturing and, honestly, significant foreign investments.
When we are no longer a superpower, we'll be bringing all kinds of manufacturing either home to the US or to a nearby country where we still have influence. (Canada, Mexico, maybe Central America.)
So, to all those people who complain about "Globalization", all we have to do is end the hegemony of U.S. power and it will end! Happy days will be here again!
(Of course, everyone, worldwide, but specifically in the US, will be poorer as we will have to pay more for every good and service, but, at least in this country it's all American (or close to it) made! Woo! Amiright?!)