1. what was the significance of interchangeable parts?

it made farming less profitable.
it made it possible to produce items in large numbers.
it increased the demand for slave labor.
it undermined the factory system.

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?