Yes they did. Most likely, they were new people.
A main cause of the trade was the colonies that European countries were starting to develop. In America, for instance, which was a colony of England, there was a demand for many labourers for the sugar, tobacco and cotton plantations. Paid labourers were too expensive, and the indigenous people had largely been wiped out by disease and conflict, so the colonisers turned to Africa to provide cheap labour in the form of slaves.
The Anti-Federalists were most concerned with the fact that the Constitution was giving far too much power to the central government over the states--meaning that they feared the federal government would become tyrannical.
I believe the answer is D. WWI was the first "total war," in which all of the people in all of the involved countries participated and were impacted.
