Thomas jefferson’s declaration of independence along with writings from other thinkers of the enlightenment influenced leaders of the french and american revolutions true or false?

You are a historian studying britain. you believe that a rise in the average british citizen's income between 1800 and 1850 can be linked to a rise in literacy. you have many sources of data from a town in britain covering that period. which four types of data would you study to investigate this theory?