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The Pony Express was a mail service that ran between Missouri and California in the United States of America from April 3, 1860, to October 26, 1861. It used relays of horse-mounted riders to deliver messages, newspapers, and mail. The Pony Express cut the time it took for communications to travel between the Atlantic and Pacific coastlines to around 10 days during its 18 months of operation.
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In 1860, mail traveled through and into Nevada by something called, "The Pony Express." According to Wikipedia.com "The Pony Express was a mail service delivering messages, newspapers, and mail using relays of horse-mounted riders that operated from April 3, 1860, to October 26, 1861, between Missouri and California in the United States of America."