American urban history embraces all historiography related to towns, cities, and metropolitan regions in the United States. American urban history includes the examination of places, processes, and ways of life through a broad and diverse range of themes including immigration, migration, population distribution, economic and spatial development, politics, planning, race, ethnicity, gender, and sexuality. Urban history emerged as an identifiable subfield of United States history in the mid-20th century, admittedly well after the establishment of similar areas of inquiry in other professional fields and academic disciplines, particularly sociology. Beginning in the 1930s and 1940s, a small number of academics, led by noted social historian Arthur M. Schlesinger, Sr., commenced the first wave of scholarly interest in American urban history with works on colonial seaports and select 19th-century cities. By the 1950s, urban history coalesced as a recognizable subfield around a reformulation of American history, emphasizing the establishment of towns, rather than the pursuit of agriculture, as the spearhead for the formation and growth of the nation. The 1960s and 1970s witnessed a second round of interest in American urban history, set against the backdrop of the tremendous political and social changes that swept the nation and transformed the historical profession. Through innovative models of scholarship that broke with traditional consensus history, notably pioneering quantitative research methods, a self-identified “new urban history” emerged that emphasized spatial development as well as social, economic, and political mobility, conflict, and change. Over time, this new urban history was largely subsumed within social history, given the fields’ intersecting and overlapping interests in social and political issues viewed through the lenses of race, class, and gender. Social history’s broad focus resulted in an explosion of scholarship that all but dominated the American historical profession by the late 20th century. From the mid-1970s through the 1990s, books with urban settings and themes, most of them well within the camp of social history, won an impressive number of Bancroft prizes and other prestigious awards. Urban history itself has survived—even thrived—without a widely agreed upon canon or dominant research methodology. Scholars continue to make significant contributions to urban history, whether or not they embrace the title of urbanist. Note that attendance at the biannual meetings of the Urban History Association has grown significantly over the last two decades. The sources in this article’s twenty subject headings have been arranged to illustrate the depth and breadth of each prominent theme in the field and are by no means an exhaustive list of such scholarship, but rather a sampling of the most influential and innovative examinations of America’s urban canvas.