African immigrants were brought to America by

African immigrants were brought to America by European slave traders from Portugal, Spain, France, the Netherlands and Great Britain.

Explanation:

African people were brought to America in European ships which belonged to different slave traders from the previous mentioned countries, in the context of the Trans-Atlantic Slave Trade, which consisted of three different strategic locations for exchange and commercialization before sailing to America: Europe, the Caribbean and West Africa.

The Great Migration, sometimes known as the Great Northward Migration or the Black Migration, was the movement of 6 million African Americans out of the rural Southern United States to the urban Northeast, Midwest, and West that occurred between 1916 and 1970.