Relationship of international law and municipal law — Act of State and justiciability — United States act of State doctrine — Decision by foreign government to impose debt moratorium — Whether compatible with United States policy — Whether claim barred by act of State doctrine — Extraterritorial effect — Situs of debt — Conduct of foreign relations — Relationship between courts and Executive

Economics, trade and finance — Currency regulation — Debt repayment — Government restricting payments in foreign currency because of economic problems — Promissory notes payable in United States dollars in New York — Situs of debt — Whether refusal to pay an act of State — The law of the United States