USA would be very smart to buy land, problem is that there are no sellers. History has proven that buying is worth it.
Example: USA is running almost a $1 TRILLION deficit. Make it two and "buy" Greenland. No rational person one would complain and Denmark /Greenlanders could set up a special fund ala Norway with the money https://en.wikipedia.org/wiki/Government_Pension_Fund_of_Nor...