When do historians believe that the use of slavery started? 6800 BC in Mesopotamia

618 AD in China

1200 BC in the Roman Empire

3500 BC in Babylonia​

The answer would be option a , b, and c.

The social difference that caused sectionalism in the antebellum era would be c.)  north was disorganized. the north had slow population growth, where as the south had mass immigration.hope this really mark