States as international persons — In general — Recognition of acts of foreign States and governments — Doctrine that court will not give effect to foreign confiscatory legislation in respect of property outside jurisdiction of confiscating State — The law of the United States

State responsibility — For interference with concessions — Oil exploration concessions obtained by United States company in Libya — Law requiring provision of guarantees for Libyan Petroleum Ministry for each concession — Guarantees provided through certain banks — Demand by Libyan Government for payment of guarantees — Allegation by company that demand part of a policy of confiscation of American owned property — Whether bank could be enjoined from responding to demand for payment of guarantees — The law of the United States