Why was the presidential election of Abraham Lincoln such a big deal?

The presidential election of Abraham Lincoln in 1860 was significant because it highlighted deep divisions in the United States, particularly over the issues of slavery and states' rights. Lincoln's victory, without carrying a single Southern state, signaled a shift in political power towards the North and intensified Southern fears of losing influence. This election ultimately catalyzed the secession of Southern states and the onset of the Civil War, marking a critical turning point in American history. Lincoln's presidency would go on to redefine the nation’s values regarding freedom and equality.