Final answer:
Harriet Beecher Stowe wrote the best-selling novel Uncle Tom's Cabin, which played a significant role in supporting the abolitionist movement in the North.
Step-by-step explanation:
The best-selling novel Uncle Tom's Cabin, which significantly bolstered support for abolition in the North, was written by Harriet Beecher Stowe. As a member of a pious Connecticut family with strong moral convictions, Stowe crafted a narrative that vividly depicted the brutal realities of slavery—an institution she believed to be inherently evil. Her book not only conveyed the harsh conditions under which enslaved people lived but also highlighted the dangers they faced while attempting to escape and how the institution of slavery negatively affected slave owners. Published in 1852, Uncle Tom's Cabin quickly became an influential work, with more than 300,000 copies sold in the first nine months of publication and over a million copies by 1853. While it inspired solidarity among abolitionists and northern readers, it sparked protests and controversy in the Southern states.