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The United States bought Alaska for 2 cents an acre

The United States paid Russia $7.2 million for Alaska, less than 2 cents an acre.

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The purchase added nearly 600,000 square miles. Opponents called it Seward's Folly until the Klondike gold strike of 1896.

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Stonehenge was begun about 5,000 years ago

The first monument at Stonehenge was built about 5,000 years ago, and the stone circle was erected about 2500 BC.

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The Pony Express lasted only 18 months

The Pony Express operated for just 18 months, between April 1860 and October 1861.

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Almost 200,000 Black soldiers fought for the Union

By the end of the Civil War, almost 200,000 Black soldiers and sailors had fought for the Union and freedom.

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