How did Uncle Tom's Cabin contributed to sectionalism?

Answer 1

It opened the Northerners' eyes to the horrors of slavery and thus attracted many Northerners to the abolitionist cause, further antagonizing the South and promoting sectionalism.

Answer 2

"Uncle Tom's Cabin" contributed to sectionalism by portraying the harsh realities of slavery in the South, which angered Southern slaveholders and deepened divisions between the North and South. The novel fueled anti-slavery sentiments in the North, helping to solidify the divide between the two regions leading up to the Civil War.