Why was the Congo Free State transferred from Leopold II to Belgian rule in 1908?

The transfer of the Congo Free State from the personal control of King Leopold II to the Belgian government in 1908 was driven by two primary factors:

• International Outcry: Leopold’s regime became notorious for its extreme brutality, including the use of forced labour to extract rubber, ivory, and palm oil. His private army, the Force Publique, enforced quotas through kidnapping, mass slaughter, and the mutilation of Congolese people, including children. These atrocities were exposed by the Congo Reform Association, missionaries, and writers such as Mark Twain, leading to intense international indignation that pressured the king to relinquish his authority.12
• Economic and Political Interests: The completion of the railroad between Matadi and Kinshasa in 1898 significantly increased the region's accessibility and economic potential. This development prompted Belgian financial groups to advocate for the formal annexation of the territory by the Belgian parliament to secure their interests.3

Ultimately, the Belgian Parliament voted to annex the territory in 1908, effectively purchasing the land from the king and transforming it into the Belgian Congo.12