It's been over 60 years since a change to the American map has occurred. While that all might change with the recent DC and Puerto Rico statehood movements, this opens up the possibility to re-examine the internal divisions of the country and see if there are any better ways to break up the country.
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Sources / Links
https://www.loc.gov/item/2007628250/
https://www.loc.gov/item/98688513/
https://www.loc.gov/item/2014589396/
https://www.loc.gov/item/2019360437/
https://en.wikipedia.org/wiki/Water_resource_region
https://www.smithsonianmag.com/smithsonian-institution/visionary-john-wesley-powell-had-plan-developing-west-nobody-listened-180969182/
https://commons.wikimedia.org/wiki/File:United_States_K%C3%B6ppen.png
https://www.brookings.edu/research/americas-racial-diversity-in-six-maps/
https://www.texasmonthly.com/articles/divide-and-conquer/
https://www.washingtonpost.com/blogs/govbeat/wp/2014/11/18/the-languages-we-speak-at-home-mapped-by-county/
http://statchatva.org/2014/03/13/ancestry-who-do-you-think-you-are/