The Pony Express mail service, established in 1860, could carry mail by horseback 2,000 miles in 10 days. What were the easternmost and westernmost states of this rapid mail service?

In 1860, the fastest information from the eastern United States, the telegraph, stopped abruptly in Saint Joseph, Missouri. This made the bustling river town the logical eastern starting point for a new, faster mail route to the West. The destination was another boomtown, Sacramento, California, which had become a vital center of commerce following the Gold Rush. The Pony Express was designed to bridge this 2,000-mile communication gap between the edge of modern technology and the nation's rapidly growing Pacific coast.

To cover this vast and often dangerous territory in a record 10 days, the service relied on a highly organized network of relay stations. Brave, lightweight riders would gallop at top speed for 10-15 miles before swapping their special mail pouch, called a mochila, to a fresh horse. After riding for 75-100 miles, a new rider would take over, allowing the mail to keep moving 24 hours a day across the Great (Review) Plains, the Rocky Mountains, and the Sierra Nevada.

Despite its legendary status, the Pony Express was a short-lived venture, lasting only about 18 months. Its demise came not from failure, but from progress. The completion of the transcontinental telegraph line in October 1861 made the daring horse-and-rider system instantly obsolete. While it was a financial failure, the Pony Express remains an enduring symbol of American grit and the Wild West.