This work investigates the rapid transformation of San Francisco from a small, isolated settlement into a major American metropolis during the pivotal decade of 1846 to 1856. Roger W. Lotchin, a noted historian of urban development, utilizes extensive primary source documentation, including municipal records, contemporary newspapers, and personal correspondence, to analyze the social and political mechanisms that facilitated this growth. He argues that the city's development was not merely a product of the Gold Rush, but a complex interplay of institutional building, social organization, and the adaptation of Eastern urban models to a frontier environment.

Historians frequently cite this work as a foundational text for understanding the specific dynamics of Western urban growth in the nineteenth century. Scholars often note the rigorous archival research and the author's ability to synthesize complex demographic data into a coherent narrative of city building.