The National Center for History in the Schools at UCLA (NCHS) and the Organization of American Historians (OAH) have developed the following lessons for teaching with primary sources. This unit, like others co-published by NCHS and OAH, is the fruit of a collaboration between an academic historian and an experienced teacher of United States history. These units represent specific "dramatic episodes" in history at which you and your young scholars can pause to delve into the deeper meanings of these selected landmark events and explore their wider context in the greater historical narrative. [PDF]