On the 150th anniversary of the Battle of Antietam, a look at what the North and South were trying to achieve on the battlefield that day and how Antietam ended up changing the nature of the Civil War.
Some of the biggest human migrations coincided with major changes in climate, according to a new analysis. Researchers say early humans set out in search of climates where more food was available. And some populations stayed put in certain locations because barriers like glaciers blocked their progress.
The Battle of Antietam was the bloodiest single day in American history, and the partial victory by Union troops led Abraham Lincoln to issue the Emancipation Proclamation. Monday marks the 150th anniversary of the Civil War battle that left 23,000 men killed or wounded on both sides.
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