Europeans usually obtained slaves in Africa by which method?
A) promising them freedom if they worked in America
B) defeating their kingdom in battle
C) killing their leaders
D) buying them

D. Buying them.

Explanation:

The Trans-Atlantic Slave Trade flourished between 1450 and the end of the 19th century. European traders - Portuguese, Spanish, French, English, Dutch - arrived in their ships and bought local men, women and children. They could also organized campaigns to hunt for slaves in the area, or bought people from local merchants and rulers.  The local kings or lords in West Africa were actively involved in selling his own people as slaves for the large profitability of it.

answer: born in saint-dié, in the vosges department, france, he studied law, and was called to the bar at paris in 1854,[2] but soon went into politics, contributing to various newspapers, particularly to le temps. he attacked the second french empire with great violence, directing his opposition especially against baron haussmann, prefect of the seine department. a series of his articles in le temps was later republished as the fantastic tales of haussmannlaxupa (1868).[2]

explanation: