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Sovereignty is supreme, independent authority within a territory. Internal sovereignty: government is highest authority domestically. External sovereignty: state is equal to others, not subject to foreign control.

Legal sovereignty: the body that makes law (in Nigeria, the National Assembly). Political sovereignty: ultimate source of authority (the people who elect and can remove government).

Modern challenges to sovereignty: international organizations, multinational corporations, global economic forces, human rights norms. No state is truly isolated. Sovereignty is now relative, not absolute.