What action did the confederate take soon after Lincoln became president?

Soon after Abraham Lincoln became president in March 1861, several Southern states began to secede from the Union, with South Carolina being the first to do so in December 1860. Following his inauguration, the Confederacy was formed, leading to the establishment of a separate government. The tensions culminated in the attack on Fort Sumter in April 1861, marking the start of the Civil War.