International law in general — Relation to municipal law — Treaty obligations — Duty of Member States under United Nations Charter to comply with Security Council Resolution on Southern Rhodesia — Power of Congress to override this obligation — Political question — The law of the United States

States as international persons — In general — Sovereignty and independence — Conduct of foreign relations — Power of United States Congress to override treaty obligations — Role of the courts — Political question — The law of the United States

International organization and administration — The United Nations — The Security Council — Obligation of Member States to comply with Security Council resolution — Consideration in municipal court — Legislation inconsistent with this obligation — Security Council Resolution 232 on Southern Rhodesia — The law of the United States

Treaties — Conclusion and operation of treaties — Operation and enforcement — Necessity for municipal legislation — Congressional power to override specific treaty obligations — Duty to comply with Security Council Resolution — Embargo on trade with Southern Rhodesia — Whether Congress authorizing breach of embargo — Political question — The law of the United States