The American civil war was the war between the Southern states and Northern states of America. The started when Abraham Lincoln was elected president of the United States in 1860. He main campaigned was to end slavery in the Southern states, which against many people in the Southern states' will. The war broke out when the South or Confederate States of America(the Confederacy), led by Jefferson Davis, started the attack at Fort Sumter in South Carolina. Lincoln responded by volunteering an army from all free states. This army was called the Union. One of the most famous battles was the battle of Gettysburg, when Confederate commander Robert E. Lee won battles in the east but he had to stopped the advance because the defeat in this battle field. But after the Union gained control of the Mississippi River, the war seemed to end easily in the favored of the Northern side. The American Civil War was the deadliest war in American history. More than 620,000 American soldiers had died. But this war was one of the reason why the United States are the superpower today.