Abraham Lincoln Elected 16th U.S. President
The United States faced deep divisions over slavery's expansion into western territories as the 1860 presidential election approached. The Democratic Party split into Northern and Southern factions, nominating Stephen A. Douglas and John C. Breckinridge respectively, while the Constitutional Union Party backed John Bell. Abraham Lincoln, the Republican nominee from Illinois, campaigned on preventing slavery's spread without directly threatening it where it existed. On November 6, Lincoln secured victory with 180 electoral votes from Northern states, though he won only about 40 percent of the popular vote. His win as the first Republican president triggered immediate secession threats from Southern states.
Why it matters: Lincoln's election directly precipitated the secession of seven Southern states before his inauguration and the outbreak of the American Civil War in 1861. It marked the rise of the Republican Party as a dominant force opposed to slavery's extension. The event reshaped American politics, leading to emancipation, Reconstruction, and the preservation of the Union under new constitutional amendments.