Which of the following increased South Carolina’s desire to secede from the Union?

1.John Brown’s raid on Harpers Ferry
2.Brooks’ response to Sumner’s speech
3.the proslavery constitution submitted by Kansas
4.the decline of the Whig party

1. John Brown’s raid on Harpers Ferry is a likely factor that increased South Carolina’s desire to secede from the Union. The raid took place in 1859 and was led by abolitionist John Brown, who attempted to incite a slave rebellion by seizing a federal arsenal in Harpers Ferry, Virginia. This event further heightened tensions between the North and the South over the issue of slavery and likely contributed to the growing desire for secession amongst southern states.