King Leopold II acquired personal control over the Congo territory through diplomatic maneuvering at the Berlin Conference of 1884-1885.

Leopold II, a monarch without significant colonial possessions, harbored ambitions of securing an overseas empire. He initially used the guise of humanitarian and scientific ventures, establishing the 'International Association of the Congo' with ostensibly benevolent goals like suppressing the slave trade and opening the region to free trade. At the Berlin Conference, where European powers formalized the division of Africa, Leopold successfully persuaded the international community to recognize his association's claim over the vast Congo Basin. He presented himself as a trustee working for the benefit of civilization, securing personal sovereignty over what became the Congo Free State, rather than it becoming a Belgian colony or an internationally administered territory. This diplomatic coup was a masterstroke of political deception. While other European nations carved out colonies, Leopold secured a private domain, free from the direct oversight of a national parliament. This allowed him to operate with unprecedented autonomy, bypassing the checks and balances that might have existed had the territory been a traditional colony of Belgium. His assurances of free trade and humanitarian efforts were instrumental in gaining international approval, despite growing suspicions about his true intentions.