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.
Although the largest percentages of slaves were found in the South, slavery did exist in the middle and Northern colonies. The overall percentage of slaves in New England was only 2-3%, but in cities such as Boston and Newport, 20-25% percent of the population consisted of enslaved laborers.