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November 6, 1860Reputable sourceWell documented

The Election of Abraham Lincoln

On the timeline · around November 6, 1860 · The Election of Abraham Lincoln1861

What happened

Abraham Lincoln, the candidate of the anti-slavery Republican Party, was elected president without carrying a single Southern state. His platform of halting the spread of slavery into the western territories alarmed the slaveholding South.

Why it matters

Lincoln's victory triggered the secession crisis; within weeks Southern states began leaving the Union rather than accept his presidency.

Sources

The Election of Abraham Lincoln — The American Civil War · SourcedStory