en.wikipedia.org
en.wikipedia.org
kids.britannica.com
britannica.com
nap.nationalacademies.org
The National Academies Press
https://nap.nationalacademies.org › read › 27213 › chapter › 6
britannica.com
education.nationalgeographic.org
National Geographic Education
https://education.nationalgeographic.org › resource › united-states-regions
worldatlas.com
studentsofhistory.com
Students of History
https://www.studentsofhistory.com › regions-of-united-states
courses.lumenlearning.com
simple.wikipedia.org
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