To work on their plantations, which were their main source of income. The plantations required a lot of really intensive and dangerous work that the colonists did not want to do themselves. They realized that African slaves provided cheap labor and could be easily replaced.
Eventually, the colonists just became over reliant on this slave labor, which is why they “needed” it.
The protests of 1968 comprised a worldwide escalation of social conflicts, predominantly characterized by popular rebellions against military bureaucracies.
A "C. Representative democracy" would best describe the United States government, since representatives from each state are elected by the citizens to made decisions on their behalf.
