Hostilites began when Abraham Lincoln was elected president in 1860 causing a secession from the eleven southern slave states. The war started on April 12, 1861 and continued on until April 9, 1865 with the last shots firing in June, 1865. The Union had a force of 2,100, 000 while the the Confederates had a force of 1, 064, 000. The Union had a total of 360,000 dead while the Confederates had 260,000 bringing the total amount of casualties to 620,000. The Southern States lost after an extensive "industrial war" using mass-produced weaspons, steam ships and railroads to effect.
It was declared one of the deadliest wars in American history with 10% of Northern males dead an 30% of Southern males dead.