Central nervous system - Structure. 1  The central nervous system consists of the two major structures: the brain and spinal cord. 2  Microscopically, there are differences between the neurons and tissue of the central nervous system and the peripheral nervous system. [citation needed]
They produced flour from the wheat they grew and sold it in other colonies or to Europe. These colonies were part agriculture and part industrial. Factories in Maryland produced iron and paper, textiles were produced in Pennsylvania factories. Lumber and shipbuilding industries also had success her.
Slavery did not supply the labor force in the northern colonies, but there were slaves in the North. By the 1740s, Philadelphia was 9 percent slave; New York 18 percent. In total, there were more than 15,000 slaves in New England. There were obvious differences between slavery in the North and South.