Urban sprawl occurs when cities expand outward into rural areas, consuming land. This document summarizes some key causes and impacts of urban sprawl in the United States. Population growth is a major driver, as people seek more affordable housing and space in the suburbs. However, urban sprawl leads to increased pollution, traffic, and loss of agricultural land. It also strains infrastructure and finances as governments must expand services further out. The document recommends controlling population growth and changing attitudes about development to limit unsustainable urban sprawl.