When Lincoln was elected, America kept on adding more states, some were slave states, other were free. They balance of free and slave states kept changing, which made people angry, especially in Congress. When Lincoln came into power, everyone was scared that he would abolish slavery for good, and add more free states to the union, so congress would be able to abolish slavery, therefore leading to the Civil War.
Explanation: It was nicknamed this because Americans were proud that we had won the War of 1812 and President Monroe said that this was reason to be unified as a country
