Why did the caning of Charles Sumner divide the North and the South before the Civil War?

The caning of Charles Sumner in 1856 symbolized the escalating tensions between the North and South over issues of slavery and political violence. Sumner, an abolitionist senator, was brutally attacked by Southern congressman Preston Brooks after delivering a speech denouncing pro-slavery forces, which shocked many in the North and galvanized anti-slavery sentiment. This incident highlighted the deep ideological divide, as the North viewed it as an assault on free speech and democracy, while the South largely saw Brooks as a hero defending Southern honor. Consequently, it intensified sectional animosities and contributed to the growing rift that would ultimately lead to the Civil War.