Listen to more stories on the Noa app. Donald Trump raises a fist. Blood streaks his face. The sky is high, blue, and empty except for an American flag caught in a hard wind. A Secret Service agent ...

Sophie Mousseau is identified simply as “Arapaho” on one version of the photo and “Dakota” on another. National Anthropological Archives / Smithsonian Institution As a scholar of 19th-century American ...