Most countries in africa have a government with a strong central authority. local governments- like cities, counties, states, or provinces- have only the powers given to them by the central government. in fact, the central government may change those powers at will, without consultation of the regional areas. what system of government is being described?

a) confederal
b) federal
c) oligarchic
d) unitary

The best and most correct answer among the choices provided by your question is the fourth choice or letter D. Most African countries have Unitary form of government. 

A unitary state is a state governed as a single power in which the central government is ultimately supreme and any administrative divisions (sub-national units) exercise only powers that the central government chooses to delegate. The majority of states in the world have a unitary system of government.

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  citizens of individual states were also citizens of the united states.