Federal is defined as a. the administration of law b. a union of states under one national government c. enthusiastic support for one’s country and way of life d. the doctrine that citizens have power to decide how country should operate

B. a union of states under one national government

Explanation:

In a federal government, power is split between a central authority, such as the national government,  and constituent political units, such as each states´ authorities.

Federalism is beneficial for a country like the U.S., with such a diverse population. However,  conflicts in authority about whether something is a federal or a local government issue.

answer; the importation of slaves from africa,//   is the correct answer.

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