With the Japanese now wanting us out, and others just using us for a no-return bank, then our pres snubbing one of the few friends we have...one may think it is time to come home and build an overwhelming military for ourselves and remain "homebodies".
There are a few problems with this idea however;
1) The present admin has spent us into a hole we can't climb out of alone
2) We would have a hard time increasing GNP, just trading with ourselves.
3) We would need natural resources..oil, metals, etc..but those elected by eco-freaks have put them off limits.
4) We would need a manufacturing base, but eco-freaks, taxes and unions have driven them to foreign shores.
5) Thanks to liberal/socialist indoctrination, we have a growing body parasitic mushrooms in our own population to support.
6) Perhaps by the time anything can be remedied, the present admin will have accomplished their aim of utterly destroying our economy.
....For these and many other reasons the "go-it-alone" idea is entirely unfeasible.