This document discusses the historical development of homelessness in the United States from the post-war era to present day. It outlines how economic restructuring, urban renewal projects, and cuts to public assistance programs contributed to the emergence of mass homelessness in the late 1970s. The document also examines the Housing First model and concept of "chronic homelessness," analyzing how these terms have been defined and implemented in policy. It concludes by noting the high mortality rates and costs associated with homelessness, and how these factors have influenced arguments for housing-focused interventions.