Why was "Uncle Tom's Cabin" one of the leading causes of the Civil War?

Question

A. The South banned the book.
B. The issue of slavery became a political issue, not just a moral one.
C. The South declared war on the North for publishing the book.
D. The issue of slavery became a moral issue, not just a political one.

Answer 1

D. The issue of slavery became a moral issue, not just a political one.