His arm was amputated, and he died from pneumonia eight days later. At Chancellorsville, Jackson was shot by one of his own men, who mistook him for Union cavalry. In the mid-19th century, while the United States was experiencing an era of tremendous growth, a fundamental economic difference existed between the country’s northern and southern regions.ĭid you know? Confederate General Thomas Jonathan Jackson earned his famous nickname, 'Stonewall,' from his steadfast defensive efforts in the First Battle of Bull Run (First Manassas). WATCH: Civil War Journal on HISTORY Vault Causes of the Civil War The conflict was the costliest and deadliest war ever fought on American soil, with some 620,000 of 2.4 million soldiers killed, millions more injured and much of the South left in ruin. The War Between the States, as the Civil War was also known, ended in Confederate surrender in 1865. The election of Abraham Lincoln in 1860 caused seven southern states to secede and form the Confederate States of America four more states soon joined them. The Civil War in the United States began in 1861, after decades of simmering tensions between northern and southern states over slavery, states’ rights and westward expansion. After the Emancipation Proclamation (1863-4).