Final answer:
During the Leopold period in the Congo, millions of people are estimated to have died due to exploitation, violence, and disease.
Step-by-step explanation:
The Leopold period refers to the reign of King Leopold II of Belgium in the Congo Free State from the late 19th century to the early 20th century. During this time, the Congolese people suffered greatly under Leopold's brutal regime. While it is difficult to determine the exact number of deaths, it is estimated that millions of Congolese people died as a result of exploitation, violence, and disease.