Perhaps so, but two of the principle reasons for the "need" to import African workers were (1) the "great die-off" of the native peoples caused by importation of European diseases into a totally un-immune population (generally estimated at 75-90%) and (2) the fact that Northern Europeans, indentured or not, could not do field labor in the heat and humidity of the middle Americas (roughly, Maryland to Brazil), and all exportable crops (rice, sugar, cotton) only grew in that region.

Why people that are generally hardier and more physically fit than their "owners" would be considered inferior is an interesting point of human psychology.