Final answer:
The Dred Scott decision of 1857 denied African Americans citizenship, challenged Congress's power to ban slavery, and fueled tensions leading to the Civil War.
Explanation:
The Dred Scott Decision: The Dred Scott decision of 1857 was a landmark Supreme Court case that deemed African Americans, whether enslaved or free, as not eligible for citizenship in the U.S. This decision also declared that Congress had no authority to ban slavery in territories, undermining the Missouri Compromise.
Significance of the Dred Scott Decision: The Dred Scott decision further entrenched the legality of slavery, exacerbated tensions between the North and South, and played a significant role in pushing the nation closer to the brink of the Civil War. It also highlighted the dehumanization of African Americans and reflected the deep-seated racism prevalent in American society at that time.
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