States as international persons — In general — Sovereignty and independence — Conduct of foreign relations — Conclusiveness of statements of the Executive — Department of State letter — Diplomatic and sovereign immunity — The law of the United States

Jurisdiction — In general — Territorial — Exemptions from and restrictions upon territorial jurisdiction — Foreign States — Arbitration clause in charterparty — Diplomatic immunity — Effect of Department of State letter — The law of the United States

Diplomatic and consular intercourse and privileges — Permanent diplomatic envoys — Privileges and immunities of diplomatic envoys and their staff — Sovereign immunity — Agent of Algerian Government concluding charterparty agreement — Arbitration clause — Whether Court having jurisdiction to compel arbitration — Identity of respondent given as “Embassy of Algeria” — Effect of Department of State letter — Effect of absence of diplomatic relations between United States and Algeria — The law of the United States