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Africa holds 30 percent of the world's mineral reserves yet accounts for less than 3 percent of global GDP. The prevailing explanation — governance failure — is incomplete. This paper argues that the primary structural determinant of African underdevelopment is a measurable sovereignty deficit: the gap between the formal independence African states achieved at independence and the substantive economic sovereignty they actually exercise. To measure this deficit, we introduce the African Sovereignty Index (ASI), the first composite longitudinal quantitative framework measuring economic sovereignty across African states from 2000 to 2024. The ASI is constructed from six dimensions — monetary autonomy, debt architecture, trade sovereignty, resource retention, military independence, and fiscal autonomy — and applied to 20 African states covering all five continental regions, producing 500 country-year observations. Data are sourced from the World Bank World Development Indicators, UNDP Human Development Reports 2025, IMF programme archives, ISS Africa, SIPRI, and the Extractive Industries Transparency Initiative (EITI). Individual country time series regressions find that within-country changes in ASI scores significantly predict changes in GDP per capita (9 of 20 countries, significant positive), Human Development Index (4 countries, significant positive), and manufacturing value added (9 countries, significant positive). CFA franc zone member states average an ASI of 56.2 compared to 76.2 for non-CFA states — a 20-point sovereignty gap sustained across the full 25-year period. Four paired case studies confirm the four central mechanisms: Botswana versus the DRC (resource retention produces a $7,047 per capita income gap), Ghana versus Côte d'Ivoire (monetary sovereignty enables economic adjustment), Rwanda versus Mali (military independence predicts political stability), and Ethiopia versus Zambia (debt architecture determines development trajectory). The ASI produces precise, dimension-specific policy prescriptions: Ghana needs debt relief not governance reform; Mali needs CFA franc monetary sovereignty and domestic military capacity; the DRC needs resource retention not democracy promotion. The paper concludes that measurement changes the terms of the African development debate — from vague governance prescriptions to specific, quantifiable, actionable sovereignty restoration. Dataset: 20 African states | 2000–2024 | 500 country-year observations Data sources: World Bank WDI | UNDP HDR 2025 | IMF Archives | ISS Africa | SIPRI | EITI Author: Isaac Osei Owusu | MSc Monetary and Banking Economics | University of Bejaia, Algeria | Independent Researcher — African Political Economy | Accra, Ghana ORCID: 0009-0000-2525-2608 Portfolio: isaac-osei-owusu-portfolio.netlify.app