What was the most significant difference between British colonies in the north (New England) and those in the south? A. Northern colonies established self-rule and elective assemblies; southern colonies were ruled by governors appointed by the monarchy. B. Northern colonies developed as trade and manufacturing centers, and southern colonies as agricultural ones. C. Southern colonies developed as trade and manufacturing centers, and northern colonies as agricultural ones. D. Slavery was illegal in southern colonies, but allowed in northern ones.