Sean Harvey explores the morally entangled territory of language and race in this intellectual history of encounters between whites and Native Americans in the eighteenth and nineteenth centuries. Misunderstandings about the differences between European and indigenous American languages strongly influenced whites' beliefs about the descent and capabilities of Native Americans, he shows. These beliefs would play an important role in the subjugation of Native peoples as the United States pursued its "manifest destiny" of westward expansion.

Over time, the attempts of whites to...