Why did most U.S. states adopt the Auburn system by about 1850?

By approximately 1850, most U.S. states had adopted the Auburn system over the competing Pennsylvania system primarily due to economic factors. While both systems were founded on the belief that contact between inmates reinforced criminal behavior, the Auburn model proved to be significantly less expensive to construct and maintain.123

Unlike the Pennsylvania system, which required inmates to perform handicraft work in isolation within their cells, the Auburn system utilized congregate workshops during the day. This allowed prisons to offset the costs of incarceration by fulfilling private-industry contracts, making the model more financially sustainable.123

Additionally, the Auburn system’s architectural design—featuring small, back-to-back interior cellblocks—became the standard for prison construction across the United States. Although the system relied on strict discipline, enforced silence, and corporal punishment to manage inmates, its economic efficiency ensured its status as the dominant model for nearly a century.2