This lesson plan aims to have high school students examine the causes and effects of the Vietnam War through analyzing primary source documents representing different perspectives on the war. Students will break into groups to read documents from the viewpoint of an anti-war protester, pro-war soldier, anti-war soldier, or government official. After discussing in their groups, students will present arguments justifying their stance on whether U.S. involvement in Vietnam was justified. The lesson intends to improve students' analytical thinking and ability to participate in discourse through evaluating historical interpretations of the controversial war.