Fill in the gaps with blue, and you have something very similar to the population density map of the USA: https://mwlibertyfest.files.wordpress.com/2009/06/us-p

Fill in the gaps with blue, and you have something very similar to the population density map of the USA: https://mwlibertyfest.files.wordpress.com/2009/06/us-pop-dist.gif https://mwlibertyfest.files.wordpress.com/2009/06/us-pop-dis... This seems to reflect the "graying" of rural America: https://www.theatlantic.com/business/archive/2016/06/the-graying-of-rural-america/485159 https://www.theatlantic.com/business/archive/2016/06/the-gra.... Younger generations are moving to denser areas, driving property values up. This isn't a bad thing per se (denser populations are more environmentally friendly), but is probably driving some of the division in the USA today.