WASHINGTON — The Trump administration has ordered several National Park Service sites to take down materials related to slavery and Native Americans, including an 1863 photograph of a formerly enslaved man with scars on his back that became one of the most powerful images of the Civil War era.

The moves by the administration were outlined in internal emails reviewed by The New York Times and two people briefed on the matter who spoke on the condition of anonymity because they were not authorized to comment publicly.

The directives stemmed from President Donald Trump’s executive order in March that instructed the park service to remove or cover up materials that “inappropriately disparage Americans,” part of a broader effort by Trump to promote a more positive view of the nation’s history

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