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United States - Wikipedia
United States | History, Map, Flag, & Population | Britannica
The U.S. and its government | USAGov
List of states and territories of the United States - Wikipedia
美国 - 维基百科,自由的百科全书
United States - Simple English Wikipedia, the free encyclopedia
United States Facts | Britannica
美国(北美洲国家)_百度百科
美国 - 维基百科,自由的百科全书
United States - World Factbook Glyph