Within three months of Abraham Lincoln's election as the 16th President of the United States in November 1860, seven Southern states had seceded from the Union. These states were South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas. This secession eventually led to the formation of the Confederate States of America in early 1861, marking the beginning of the American Civil War.
So Within three months of Abraham Lincoln's election, a total of seven Southern states had seceded from the Union.