Territorial History of the USA: Every Month for 400 Years
Why the open web links it
Visually traces the territorial and state boundary changes of the contiguous U.S. over 400 years.
Linked by 3 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including uchicago.edu, laughingsquid.com, themorningnews.org.