State immunity — Jurisdictional immunity — Expropriation of majority shareholding in company — Failure to pay compensation — Action by shareholder — Whether within jurisdiction of United States courts — Whether expropriating State entitled to sovereign immunity — Foreign Sovereign Immunities Act 1976, Section 1605(a)(3)

Treaties — Effect in municipal law — Ethiopia-United States Treaty of Amity and Economic Relations, 1953 — Provisions regarding dispute settlement — Whether depriving United States courts of jurisdiction over action by United States company regarding expropriation

Relationship of international law and municipal law — Treaties — Effect in municipal law of State party — Effect on jurisdiction of courts in claim by company against party to treaty — The law of the United States