One of the MOST important motives for the European imperialism in Africa in the late 1800s was what?
Africa provided a source of religious conversion of Africans to Islam.
Africa provided a source of new technology to gain from Africans.
Africa provided a source of slaves for the American colonies.
Africa provided a source of raw materials used in industry,

Explanation is in the file

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D

Explanation:

The colonies had already become the USA in the 1800s, so that's not it. Africa did not have new technology to offer, and conversion to Islam was not a factor in imperialism. Africa provided diamond, salt, sugar, gold, iron, etc

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

small european communities with shared traditions consolidated into large new states (apex)