The field of American history has undergone remarkable expansion in the past century, all of it reflecting a broadening of the historical enterprise and democratization of its coverage. Today, the shape of the field takes into account the interests, identities, and narratives of more Americans than at any time in its past. Much of this change can be seen through the history of the Organization of American Historians, which, as its mission states, "promotes excellence in the scholarship, teaching, and presentation of American history, and encourages wide discussion of historical questions and...