As for "eternal indebtedness," the United States is much more indebted to France, a country with which the United States has often had strained ties, easily the most powerful foreign country to help the Americans (motives aside). Yet even there, helping France in World War 1, and liberating it in World War 2 probably repaid that debt.
Man is only eternally indebted to God.
A proud Pole here living just off of Pulaski Highway (Rt 40) North Of Baltimore Maryland.