Who lived in the congo before the belgians arrived?

The pre-colonial history of the Democratic Republic of the Congo encompasses the political, economic and social history of the territory of the modern-day Democratic Republic of the Congo before the arrival of European colonial rule in the late 19th century.  

The current territory of the Democratic Republic of Congo was occupied by humans in the Paleolithic at least 80,000 years ago. Waves of Bantu migrations from 2000 BC to 500 AD moved into the basin from the northwest and covered the precolonial states absorbed or overthrown by the colonial powers.  

The Bantu migrations added to and displaced the indigenous Pygmy populations in the southern regions of the modern Congo states. The Bantu imported agriculture and iron-working techniques from West Africa into the area, as well as establishing the Bantu language family as the primary set of tongues for the Congolese. Subsequent migrations from the Darfur and Kurdufan regions of Sudan into the north of Congo, as well as East Africans migrating into the eastern Congo, added to the mix of ethnic groups.

c. free trade can lead to low pay for workers in poorer countries.