Which publication affected the views many northerners towards slavery

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Explanation:

Uncle Tom's Cabin; or, Life Among the Lowly is an anti-slavery novel by American author Harriet Beecher Stowe. Published in 1852, the novel had a profound effect on attitudestoward African Americans and slavery in the U.S. and is said to have "helped lay the groundwork for the Civil War".

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porter is writing economic history because he is focusing on the cost of developing vaccines.