How did contacts among europeans, native americans, and africans alter the economies of the three continents?

Europe became the richest continent in World history as slaves from Africa could be used to produce agricultural commodities in American lands. On the other hand, Africa's resources diminished due to slavery and unscrupulous European plunder. America also declined significantly since the majority of its population died due to European diseases.

Idon't think any of em are right, you need to add the number of what paragraph you got your citation from