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Portuguese explorers began voyages south along the Atlantic coast of Africa.  First the Portuguese established trading posts along the coast of West Africa, but gradually moved further south along the coast. This was the beginning of the African slave trade. The Europeans is different from the Arabs, they did not conduct raids themselves, but bought slaves from Arab slave brokers and African chiefs. Europeans built trading post and forts all along the coast of West Africa.  The slaves were transported across the Atlantic Ocean primarily to Brazil, the West Indies and the English colonies in North America. As the demand for slaves expanded, whole areas of Africa were depopulated. The European African slave trade began during the mercantalist era. It continued well into the industrial era. In fact because African slaves played a major role in the industrial revolution in Europe.

Explanation:

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.