What happened in the 1850s?
📬 Pony Express: Revolutionizing U.S. Mail Delivery (1860)
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Further Reading
Pony Express | U.S. Mail Delivery History & Map | Britannica (britannica.com)
Pony Express - U.S. Postal Facts (usps.com)
The Story of the Pony Express | National Postal Museum (si.edu)
The real story behind the Pony Express - Wells Fargo History (wf.com)
The Pony Express: Fast Facts of Historic Mail Service (learncalifornia.org)
Pony Express debuts | April 3, 1860 | HISTORY (history.com)
The Pony Express - About USPS Home (usps.com)