Origins in the political and economic changes during the revolutions of late 18th century. The privileges of the cleregy and the nobility were abolished and the state system dissapear. Industrial revolution increased the importance of wealthy bourgueoisie. New social group: The workers of the fabrics: Proletariat. Was divided in three groups: Upper class, nobility and wealthy bourgueoisie. Middle class, civil servants, lawyers, doctors, small merchants, artisans and farmers with own lands. Working class, proletariat and agricultural labourers.