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Visitors to national parks this summer may notice striking new signs asking people to report any 鈥渘egative鈥 depictions of historic events or figures they encounter. Advocates for national parks worry that this will lead to censoring less flattering parts of U.S. history. We hear about how this order could impact Colorado鈥檚 national park sites, like the Amache internment camp or the Sand Creek Massacre historic site.