Most agree that the event now simply known as 9/11 proved to be a turning point in U.S. history. Nothing will ever be the same again politically, legally, and socially. Besides being the most devastating workplace disaster to occur in New York City and the nation, it was a moment that defined a generation and rivals similar generation-defining moments such as those of December 7, 1941, and November 22, 1963. Ninety years before 9/11, however, another incident claimed the title of the worst workplace disaster in the annals of New York City and the nation. The Triangle Shirtwaist Factory fire on March 25, 1911, was a pivotal historical event in terms of its tragedy and aftermath. Time has unfortunately consigned the fire to near oblivion. Indeed, few history textbooks present the incident and its far-reaching political, legal, and social effects in the detail that they deserve. In this article, the author presents compelling reasons for closely examining that historic event and offers educators an effective strategy for doing so. In his acclaimed history "Triangle: The Fire That Changed America," David Von Drehle (2003) provides a comprehensive examination of the fire and its seemingly forgotten historical importance. Using that powerful book as a basis, the author provides middle school and high school social studies educators with an adaptable story--and simulation-based lesson composed of four parts that can be executed over approximately three or four conventional class periods.