How were the majority of national borders in Africa determined? A.
following historic Tribal lines

B.
former colonial claims by Eurpean Countries

C.
natural features such as rivers and deserts

D.
Negotiations by African leaders such as Nnamde Azikiwe

B. former colonial claims by European Countries

Explanation:

The majority of Africa's Borders have remained the same since those nations declared independence.

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the answer is "by providing data about careers and annual mean wages"

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: