The nineteenth-century middle-class ideal of the married woman was of a chaste and diligent wife focused on being a loving mother, with few needs or rights of her own. The modern woman, by contrast, was partner to a new model of marriage, one in which she and her husband formed a relationship based on greater sexual and psychological equality. In Making Marriage Modern, Christina Simmons narrates the development of this new companionate marriage ideal, which took hold in the early twentieth century and prevailed in American society by the 1940s.

The first challenges to public...