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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/humanities/us-history/civil-war-era/slavery-and-the-civil-war/v/increasing-political-battles-over-slavery-in-mid-1800s


Kim and Sal talk about increased tensions between slave and free states as new territory is added after Mexican-American War and from Compromise of 1850 (especially the Fugitive Slave Act).

US history on Khan Academy: From a mosquito-ridden backwater to the world's last remaining superpower, the United States of America is a nation with a rich history and a noble goal: government of the people, by the people, for the people. Its citizens' struggle to achieve that goal is a dramatic story stretching over hundreds of years.

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