The archetype of the American explorer, a rugged white man, has dominated our popular culture since the late eighteenth century, when Daniel Boone’s autobiography captivated readers with tales of treacherous journeys. But our commonly held ideas about American exploration do not tell the whole story—far from it. The Explorers rediscovers a diverse group of Americans who went to the western frontier and beyond, traversing the farthest reaches of the globe and even penetrating outer space in their endeavor to find the unknown. Many escaped from lives circumscribed by racism, sexism, poverty, and discrimination as they took on great risk in unfamiliar territory to exercise personal freedom. Born into slavery, James Beckwourth found freedom as a mountain man and became one of the great entrepreneurs of Gold Rush California. Matthew Henson, the son of African American sharecroppers, left rural Maryland behind to seek the North Pole. Women like Harriet Chalmers Adams ascended Peruvian mounta