What were three reasons for the development of the slave trade?

Shortage of labour: The plantations that were established in America were extremely profitable. However, the population of the region was too small to supply the labor that was necessary to operate them (both in terms of Native Americans and Europeans). Therefore, African people fulfilled this role by providing cheap labor.Resistance to disease: While many Native Americans died easily from European diseases, African people were more resistant to them because of the long history of contact between the two continents. This made them more resilient.Ideas of racial superiority: Most slaveholders and slave traders believed African people to be inferior to Europeans, which allowed them to enslave them and treat them badly with little to no remorse.