How do these trade routes reflect the demand for slaves

I would say that trade routes reflected the demand for slaves , because over time between africa , england , and the united states it started to build a sort of triangular pattern of slaves being exchanged causing the name the trans -atlantic slave trade . ( thats the pattern ) . your answer would be that as trade routes increased to form the transatlantic slave trade it started reflecting the demand for slaves as this pattern of trade became more popular .  

The answer is a hope