During American expansion between 1800 and the 1850s, which section's interests were most threatened?

Name: During American expansion between 1800 and the 1850s, which section's interests were most threatened?
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The South's interests were most threatened during American expansion between 1800 and the 1850s due to the growing sectional conflict over the extension of slavery into new territories, which threatened the South's economic and political power.

During American Expansion Between 1800 and the 1850s, Which Section's