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United States - Wikipedia
アメリカ合衆国 - Wikipedia
United States - Simple English Wikipedia, the free encyclopedia
United States | History, Map, Flag, & Population | Britannica
The social, economic, and political history of the United States
アメリカ合衆国|外務省 - Ministry of Foreign Affairs of Japan
United States - BBC News
Geography of the United States - Wikipedia
Latest U.S. News | Top headlines from the USA | Reuters
United States History Portal | Britannica