The American Civil War: What Happened and Why It Mattered

A House Divided

By 1860, America was two countries: the industrial North (free states) vs. the agricultural South (slave states). When Abraham Lincoln — opposed to slavery's expansion — won the presidency, 11 Southern states seceded, forming the Confederacy. Lincoln refused to let the Union break. War began April 1861.

Bloodiest War in American History

750,000 soldiers died — more than all other US wars combined. New rifled muskets made old tactics suicidal. Gettysburg (1863) was the turning point: Lee's invasion of the North failed. Lincoln's Emancipation Proclamation (1863) freed slaves in rebel states, making abolition a war aim.

Lincoln's Triumph and Murder

General Grant's relentless pressure crushed the South. Lee surrendered April 9, 1865. Five days later, Lincoln was assassinated — he never saw Reconstruction. The 13th Amendment abolished slavery forever.

Why It Still Matters

The Civil War decided America would be one nation, not two — and that slavery would end. But Reconstruction failed; Jim Crow segregation followed. The war's questions about race, federal power, and American identity are still being fought today.