Leopold believed that overseas colonies were essential for Belgium to become a great power, even though the Belgian legislature did not support such ventures. He pursued colonies independently, eventually securing the Congo as his personal possession, financed through loans from the Belgian government. To justify this private empire, he created the International African Society (IAA) in 1876, presenting it as a philanthropic and scientific organization. Its stated goals included suppressing the slave trade, uniting local tribes, modernizing the region, and bringing “morality” to the Congo—claims used to legitimize his ambitions.

Leopold was highly skilled in using media to support his control of the Congo. He promoted the image of a benevolent ruler bringing civilization to Africa, while concealing the violence of his regime. This propaganda war intensified as critics exposed abuses. British activist Edmund Dene Morel led a global campaign using newspapers, pamphlets, eyewitness accounts, and photographs from missionaries to reveal the truth. As Morel gained influential supporters, international pressure mounted, undermining Leopold’s narrative.

Under Leopold’s rule, the Congo Free State became a vast forced‑labor system. Although the sources emphasize his acquisition and propaganda, they also document the violence and exploitation that critics publicized worldwide. Reports and photographs circulated by missionaries and reformers revealed widespread brutality, including forced labor, mutilation, and mass death tied to rubber extraction. These revelations formed the backbone of the Congo Reform Association’s campaign against Leopold.

The international outcry—driven by Morel, missionaries, journalists, and political leaders—eventually forced Leopold to surrender control. By 1908, the Belgian government took over the territory, ending his personal rule. The propaganda war, once dominated by Leopold, had turned decisively against him as evidence of atrocities became impossible to suppress.