Ans
In finance, an exchange rate is the rate at which one currency will be exchanged for another. It is also regarded as the value of one country's currency in relation to another currency.
Explanation:
A African Slaves because at that time the south was popular for African slaves
The smallpox epidemic.
The millitary invasion was devastating but not to the extent of smallpox.
The Jesuits did not really devastate the New World.
Enslavement for sugar plantations mostly occurred with Africans.
Smallpox, brought in by the Columbian Exchange, had a widespread impact that killed a large portion of natives in the Americas.
So the Smallpox epidemic is the answer.