Jurisdiction — In general — Territorial — Territorial limits of jurisdiction — Calvo clause — Forum non conveniens — Action by holder of royalty in oil concession against concessionaire — Nationalization of concession by Venezuelan Government — Concession subject to Calvo clause — Whether clause also applicable to royalty agreement — The law of the United States

States as international persons — In general — Recognition of acts of foreign States and governments — Application to dismiss action for damages — Nationalization of oil concessions — Whether holder of a royalty interest entitled to a share of indemnification — Whether United States courts entitled to interpret Venezuelan legislation to determine validity of acts done by Venezuelan Government — Act of State doctrine — The law of the United States