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United States - Wikipedia
United States | History, Map, Flag, & Population | Britannica
The U.S. and its government - USAGov
United States - The World Factbook
United States Facts | Britannica
United States Map - World Atlas
United States - Simple English Wikipedia, the free encyclopedia
The social, economic, and political history of the United States
United States Summary - The World Factbook
United States - National Geographic Kids
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