The correct answer is D. Kansas-Nebraska Act, Missouri Compromise, and Fugitive Slave Act of 1850 were a part of the U.S. government's efforts to preserve the Union.
The Fugitive Slave Act energized the North's abolitionist movement, which infuriated the South. The Fugitive Slave Act's implementation exacerbated the North and South's division and sparked the developments that eventually brought about the Civil War.
Thus, Lincoln insisted at the commencement of the struggle that its goal was the preservation of the Union, not the release of Southern slaves.
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