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Column E: Human Population numbers from United States Census Bureau Population Estimates for July 1, 2018. https://www.census.gov/quickfacts/fact/table/US/PST045218
Column F: Land Mass numbers from United States Census Bureau State Area Measurements. https://www.census.gov/geographies/reference-files/2010/geo/state-area.html
Column G: Poverty Rate 3-Year Average from United States Census Bureau. https://www.census.gov/data/tables/2017/demo/income-poverty/p60-259.html
Column H: These dates are pieced together from several websites: Statescapes.com, NCSL.com, Balletopedia.org, and state legislative websites.
Column I: This information is from http://www.statescape.com/resources/legislative/session-schedules