Web Resources
The URLs for data presented herein are as follows:1000 Genomes, http://browser.1000genomes.org
1860 Census, https://www.census.gov/history/www/through_the_decades/overview/1860.html
2010 Census, http://www.census.gov/2010census/
American Community Survey Summary File 2007–2010, http://www2.census.gov/acs2011_5yr/summaryfile/
American FactFinder, http://factfinder2.census.gov/
Free Zipcode Database, http://federalgovernmentzipcodes.us/
How Many Genetic Ancestors Do I Have?, http://gcbias.org/2013/11/11/how-does-your-number-of-genetic-ancestors-grow-back-over-time/
International HapMap Project, http://hapmap.ncbi.nlm.nih.gov/
Python, https://www.python.org/
R statistical software, http://www.r-project.org/
Roots into the Future, https://www.23andme.com/roots/
The Black Population: 2010, http://www.census.gov/prod/cen2010/briefs/c2010br-06.pdf
Trans-Atlantic Slave Trade Database, Introductory Maps, http://www.slavevoyages.org/tast/assessment/intro-maps.faces