The fighting between Northern anti-slavery states and Southern pro-slavery states had escalated so far, that seven states decided in 1860 to secede from the Union. In this inquiry lesson, students will generate hypotheses as to what caused the Civil War. They will continue to revise their hypotheses using each slide to analyze and evaluate some primary and some secondary, and then come to a conclusion to the question: Why did the United States Civil War occur?The lesson is DIFFERENTIATED by visu