No imports, no exports?

Well, you could pretty much rule out most of our technology based society. Things break, and after two years we be pretty short of replacement parts for some items. (High tech factories take YEARS to get going) Not only that, we're goign to be pretty short of raw materials for some items, notably titanium, molybdenum, tantalum, and other metals we're not able to feasibly produce in this country.

If we cut all foreign aid and used the money to pay off the debt? We'd still have a looooooooooong way to go. Our foreign aid budget is a miniscule part of federal spending.

#5 would require a complete restructuring of the Constitution, as SS is part of the federal budget, and the federal budget is under the control of congress. Good luck getting an amendment passed on that one.