Answer:
A. Includes citations for all the sources that support it.
The part that did the practice of slavery the most was the South.
The United States and South Africa share strong educational and people-to-people ties, significant economic and political interests, as well as common development objectives throughout Africa. ... The United States seeks opportunities for increased U.S.-South African cooperation on regional and international issues.
The main problems of evidence in dealing with early civilizations is that much of the potential evidence itself--such as tools, homes, etc--has vanished due to the fact that it was made of materials such as clay that could not withstand the test of time and weather.
