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Map of the United States - Nations Online Project
Borders of the United States - Vivid Maps
How were state shapes, boundaries determined? - USA TODAY
State Maps - Online Maps of USA States
How Did the States Get Their Shapes? - Wonderopolis
USA State Boundaries - ArcGIS
United States Lines - Wikipedia
United States Map and Satellite Image - Click a State - Geology.com
Why Are U.S. Borders Straight Lines? - JSTOR Daily
ArcGIS