Some of the key factors that led to Tennessee's secession include:
* The state's strong ties to the South. Tennessee was a slave state, and many of its citizens had family and economic connections to the South.
* The election of Abraham Lincoln as president in 1860. Lincoln was a member of the Republican Party, which was opposed to the expansion of slavery into new territories. Many Tennesseans feared that Lincoln's election would lead to the abolition of slavery in the South.
* The secession of other Southern states. As other Southern states began to secede from the Union, pressure grew on Tennessee to do the same. Many Tennesseans felt that the state would be better off joining the Confederacy than remaining in the Union.
In February 1861, Tennessee voted to secede from the Union. The state sent troops to fight for the Confederacy, and it played a significant role in the Civil War.
After the war, Tennessee was readmitted to the Union in 1866. The state's decision to secede from the Union was a complex and controversial one, and it had a profound impact on the state's history.