What was the relationship between westward expansion, slavery, and sectional divisions in the antebellum period?

Assigned Reading: American Yawp, ch. 11 (The Cotton Revolution
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), ch. 12 (Manifest Destiny
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), & ch. 13 (The Sectional Crisis
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).
Write a 250- to 350-word post answering the prompt below. Make sure that your post is polished, clear, and detailed. Cite your sources using the format described in the Tips and Guidelines for Forum Posts page. Your post must include information only drawn from the assigned chapters from the American Yawp. You are encouraged, but not required, to incorporate material from the primary sources at the end of each chapter.
What was the relationship between westward expansion, slavery, and sectional divisions in the antebellum period?
Why did Americans believe territorial expansion was necessary? Relatedly, what justifications did they give for the dislocation of Indigenous and other long-settled peoples in areas within or adjacent to U.S. borders?

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