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来源: www.loc.gov (Library of Congress), www.nps.gov (National Park Service), www.si.edu (Smithsonian Institution), www.archives.gov (National Archives), www.historians.org (American Historical Association), www.americanantiquity.org (Society for American Archaeology), www.neh.gov (National Endowment for the Humanities), www.jstor.org (JSTOR academic database), www.history.state.gov (Office of the Historian, U.S. Department of State)