Final answer:
Harriet Beecher Stowe's novel Uncle Tom's Cabin shaped the attitudes of white Northerners by highlighting the moral implications of slavery and linking the antislavery cause with the preservation of the family.
Step-by-step explanation:
Harriet Beecher Stowe's novel Uncle Tom's Cabin played a significant role in shaping the attitudes of white Northerners during the 1850s culture war. The book depicted the harsh conditions and suffering faced by slaves, highlighting the moral implications of slavery. By linking the antislavery cause with the preservation of the family, Stowe made readers think deeply about the institution of slavery and its impact on individuals and society.