How did epidemics among the native american populations contribute to an increase in the trade of enslaved africans

is this a multiple choice question? if so, could i see the answers to give you the right one!

these civilizations were located around fertile rivers, where they could produce an abundance of crops

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live