This document contains lecture notes on the outbreak of the American Civil War. It discusses key events and factors that led to war, including the 1860 presidential election, southern secession, and failed compromise efforts like the Crittenden Compromise. It then outlines the initial mobilization for war, including the Confederate attack on Fort Sumter, northern and southern states choosing sides, and foreign diplomacy efforts during this period. The document provides an overview of the major political and military developments surrounding the start of the Civil War.