All four nations gained independence from France in **1960**, the "Year of Africa," within a span of seven weeks:
Each territory had been part of **French Equatorial Africa** (CAR, Chad) or **French West Africa** (Niger, Mali/Sudan). The 1958 French Constitutional Referendum offered autonomy within the French Community; all voted "Yes" but moved swiftly to full independence in 1960. Mali's date reflects the August 1960 collapse of the short-lived Mali Federation (with Senegal).
All four have experienced cycles of coups, authoritarian rule, drought, and insurgency (especially Mali & Niger in the Sahel crisis post-2012). They remain among the world's least developed nations (HDI), bound by the CFA franc (pegged to Euro) and shared security challenges.