California during the gold rush was a place of disputed claims, shoot-outs, gambling halls, and prostitution; a place populated by that rough and rebellious figure, the forty-niner; in short, a place that seems utterly unconnected to middle-class culture. In American Alchemy, however, Brian Roberts offers a surprising challenge to this assumption.

Roberts points to a long-neglected truth of the gold rush: many of the northeastern forty-niners who ventured westward were in fact middle-class in origin, status, and values. Tracing the experiences and adventures both of these men...