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Congo Free State, French État Indépendant du Congo, former state in Africa that occupied almost all of the Congo River basin, coextensive with the modern Democratic Republic of the Congo. It was created in the 1880s as the private holding of a group of European investors headed by Leopold II, king of the Belgians. The king’s attention was drawn to the region during Henry (later Sir Henry) Morton Stanley’s exploration of the Congo River in 1874–77. In November of 1877 Leopold formed the Committee for Studies of the Upper Congo (Comité d’Études du Haut Congo, later renamed Association Internationale du Congo) to open up the African interior to European trade along the Congo River. Between 1879 and 1882, under the committee’s auspices, Stanley established stations on the upper Congo and opened negotiations with local rulers. By 1884 the Association Internationale du Congo had signed treaties with 450 independent African entities and, on that basis, asserted its right to govern all the territory concerned as an independent state. At the Berlin West Africa Conference of 1884–85, its name became the Congo Free State, and European powers recognized Leopold as its sovereign.
