This volume offers a historical and documented account of the constitutional issues underlying President Abraham Lincoln's determination to save the Union between 1861 and 1865. It provides students of US history and politics with a simple, precise approach to the complex power game between the three branches of the federal government. While both the Civil War and the Emancipation issue are present across the different chapters, the book focuses on constitutional issues to provide a clear analysis of the way Lincoln used or misused the US Constitution in a context of emergency.