Slaves were imported into the united states beginning a. with the need for consistent agricultural labor b. with a circular trade surrounding the atlantic c. when europe demanded more goods from the americas d. with economic systems requiring free labor for success

The correct answer is D. with economic systems requiring free labor for success

An early economic argument was that slavery was needed in America because there was enough workforce to work in agriculture. But in fact, slavery permitted people to own larger farms, with larger profits in farming. Many people shifted their business into agriculture at the expense of industry because of slave work.

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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