Let’s start with their beachfront property one square mile at a time. Every year we could annex x amount to pay for the last year’s debt. Annex Day could be a national holiday! ;^)
Hell we could use this to defund the foreign aid and UN payments, the money is first deducted from the annual foreign aid we send to said country, then when that fund dries up, we start deducting from the money we send tot he UN, when that dries up we demand CASH or LAND, THEIR CHOICE!