Over time, colonial society developed a class structure with gentry at the top, followed by a middle class of skilled workers and professionals, then farmers and laborers, indentured servants, and slaves. In the 1730s-1740s, the Great Awakening religious revival movement swept through the colonies and helped colonists see each other as a united group beyond class differences. Additionally, the Enlightenment promoted the use of reason and stressed natural rights like life, liberty, and property ownership. Benjamin Franklin was a notable American scientist during this period. Improved road systems and newspapers also helped spread new ideas more quickly in the growing colonies.