On this day in 1858, Abraham Lincoln delivered his “House Divided” speech upon acceptance of Republican Party’s nomination for Illinois senator. In his speech, Lincoln, reaffirmed his opposition to slavery and predicted that the country would be unable to endure with both slave and free states. This was in direct opposition to his opponent, Stephen Douglas, who believed it was up to states to allow or disallow slavery. Lincoln’s speech was deemed to be radical and provided Douglas with fresh ammunition. Lincoln eventually lost the senate seat to Douglas, but his colleagues believed this speech ultimately lead to his 1860 presidential win.