Final answer:
The Lincoln-Douglas debates centered on slavery, Lincoln challenged Douglas's views, and Lincoln gained national recognition through the debates.
Explanation:
The Lincoln-Douglas debates in 1858 were significant as they provided a platform for Republican Abraham Lincoln and Democrat Stephen Douglas to engage in a series of discussions, focusing on the issue of slavery.
Lincoln challenged Douglas on his stance regarding the extension of slavery into new territories and forced him to address popular sovereignty and the Dred Scott decision.
The debates elevated Lincoln's national visibility as a Republican leader, even though he did not win a Senate seat.
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