The Cuban Missile Crisis was when USSR built missile bases in Cuba. This was a threat to the U.S. because the missiles could reach many major cities within the U.S.
Due to this threat, the United States wanted the missiles removed.
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The correct answer is:
d. Lincoln thinks the civil war will be of outstanding significance or importance.
Lincoln refers to the American Civil War (1861 - 1865), which confronted the Union and Confederate Armies. And the Battle of Gettysburg, which had taken place a few months before Lincoln delivered his Gettysburg Address, is recognized as a turning point in the war in favor of the Union cause.
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