Read this article to learn how the economic imperatives of industrialization led European nations to expand their imperial control into Africa. It features a "causes" section that discusses the impetus for each colonizing power's desire to partition a whole continent.
Scramble for Africa
The Scramble for Africa, also called the Partition of Africa, or the
Conquest of Africa, was the invasion, annexation, division, and
colonization of most of Africa by seven Western European powers during a
short period known as New Imperialism (between 1881 and 1914). The 10
percent of Africa that was under formal European control in 1870
increased to almost 90 percent by 1914, with only Ethiopia (Abyssinia)
and Liberia remaining independent, though Ethiopia would later be
invaded and occupied by Italy from 1936 to 1941. The Egba United
Government, a government of the Egba people, was legally recognized by
the British as independent until being annexed into the Colony and
Protectorate of Nigeria in 1914.

Areas of Africa controlled by European colonial powers in 1913 (Belgian (yellow), British (red), French (blue), German (turquoise), Italian (green), Portuguese (purple), and Spanish (pink) Empires)
Source: Wikipedia, https://en.wikipedia.org/wiki/Scramble_for_Africa
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