Embracing an argument-based model for teaching history, the Debating American History series encourages students to participate in a contested, evidence-based discourse about the human past. Each book poses a question that historians debate— How democratic was the U.S. Constitution? or Why did civil war erupt in the United States in 1861? —and provides abundant primary sources so that students can make their own efforts at interpreting the evidence. They can then use that analysis to construct answers to the big question that frames the debate and argue in support of their position. Emancipation and the End of Slavery poses this big question: How and why did emancipation become a goal of the Union war effort?