How and why was slavery different in the southern British colonies than it was in those belonging to the Spanish, French and Dutch?
The main difference between slavery in the southern British colonies and slavery in many Dutch, Spanish and French colonies, was that the British colonies in question were primarily built as plantations, whose main or only purpose was to produce raw materials and cash crops, like tobacco and sugar.
The production of such crops was incredibly labor intensive, and so the quantity of slaves brought in to work the fields in the southern British colonies was far greater than the number brought into work the fields in other colonies. Due to the backbreaking work required to harvest cash crops crops, the treatment of slaves in southern British colonies was also much harsher. These plantation economies depended on cheap labor in order to stay economically viable, so the fear of slave uprisings and disobedience was even greater, since the loss of slave labor would have meant the decimation of those economies. This constant fear of losing control of the enslaved workforce further contributed to the brutality of slave masters and managers brought in to oversee these plantations.