What publication had a direct effect on the attitudes of northerners toward slavery?

The publication that had a direct and profound effect on the attitudes of Northerners toward slavery was Uncle Tom's Cabin by Harriet Beecher Stowe, published in 1852.

Here's why:

* Humanizing slaves: The novel presented a vivid and emotional portrayal of the lives of enslaved people, focusing on their humanity, suffering, and the cruelty of the institution. This resonated deeply with Northerners, who had limited direct exposure to slavery.

* Emotional impact: The book's powerful storytelling and sympathetic characters stirred strong emotions in readers, provoking outrage, compassion, and a sense of moral responsibility.

* National conversation: "Uncle Tom's Cabin" sparked nationwide discussions about slavery, fueling the abolitionist movement and further dividing the country along sectional lines.

* Political impact: The book's popularity is credited with influencing public opinion and contributing to the growing anti-slavery sentiment that eventually led to the Civil War.

While other publications contributed to the evolving Northern attitude toward slavery, "Uncle Tom's Cabin" stands out for its widespread impact, emotional power, and direct contribution to the national debate.