How Lincoln dealt with secession?

Abraham Lincoln approached secession with a firm belief in preserving the Union. He rejected the notion that states could unilaterally leave the Union, viewing it as a rebellion rather than a legitimate political act. In his inaugural address, he appealed for unity and sought to reassure the Southern states that their rights would be respected while simultaneously preparing to use military force if necessary to maintain the Union. Ultimately, his administration's response to secession led to the outbreak of the Civil War.