New Orleans has always captured our imagination as an exotic city in its racial ambiguity and pursuit of les bons temps. Despite its image as a place apart, the city played a key role in nineteenth-century America as a site for immigration and pluralism, the quest for equality, and the centrality of self-making.

In both the literary imagination and the law, creoles of color navigated life on a shifting color line. As they passed among various racial categories and through different social spaces, they filtered for a national audience the meaning of the French Revolution, the...