What was the primary reason that the spanish and portuguese turned to enslaved africans as a source of labor for their mines and farms in the new world?
a. most of the native americans used as slave laborers had died from overwork and european diseases.
b. most native american slave laborers did not have the skills necessary to produce new world crops.
c. it was less expensive to transport the africans by sea than to bring in more native american slaves by land.
d. native americans were willing to the africans captive but refused to turn their own people into slaves.