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The Pony Express ceased operations today in 1861. How long had the service been in business?

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Answer:

Only 18 months. The Pony Express operated between Sacramento, Calif. and St. Joseph, Missouri, delivering mail across the continent in 10 days. It was rendered obsolete when the first transcontinental telegraph came online two days earlier. Click here for a huge version of the image above. The file is large but worth your time.