One thing about the US that seems pretty clear to me is that, whatever the fate of the dollar, which seems dubious at the present, the less the USA has to import, especially energy, and the more that it can profitably manufacture for itself, the better off we will be.  

Following that logic, we should build wind power, thermal solar and enhanced transmission facilities as fast as we can.  We should support the development of fuel efficient and primarily electric vehicles, PHEVs, along with charging infrastructure.  We should support conversion of passenger and freight rail lines to all electric.  We should support more efficient buildings. And we should support the transition to a sustainable agriculture not based on petrochemicals and mono-cultures.  All of these steps will help to keep the ambient temperature and ocean level closer to where it is now.  Finally, we should support the development of new industries based around these priorities, including providing the requisite educations.  

With such policies in place we could at least feed and house and educate ourselves and have a chance of employing the vast majority of the labor force.  Such policies would seem to have the effect of insulating the USA to some degree from the worst effects of a significant devaluation of our currency and provide us with the possibility of producing goods other countries value.  It would seem wise to move to a position of a net balance in foreign trade before we find ourselves in the position of needing things from other countries that we have no means of purchasing.

But then I, like JD, claim no particular expertise in these matters.  Most of what I think I know I owe to ET.

"It is not necessary to have hope in order to persevere."