A rider galloped out of St. Joseph, Missouri, carrying a bag of mail. His destination was nearly 2,000 miles away: Sacramento, California. The date was April 3, 1860. Between these two cities stretched some of the most challenging geography in North America. The Great Plains, the Rocky Mountains, the Great Basin Desert, and the Sierra Nevada range. The Pony Express worked like a relay race. Riders galloped between stations placed roughly every 10 to 15 miles apart. At each station, the rider would leap off one horse and onto a fresh one without stopping. After covering about 75 miles, the rider handed the mail to a new rider, who continued the journey. Roughly 80 riders were in motion at any time across the route. The route was chosen carefully based on geography. It followed rivers when possible, crossed mountain passes at their lowest points. Used flat stretches of desert where horses could run at full speed. The dangers were real: riders faced extreme weather, rough terrain, and the risk of getting lost in unfamiliar territory. The Pony Express lasted only 18 months. On October 24, 1861, the first transcontinental telegraph line was completed. Suddenly, messages could travel from coast to coast in minutes instead of days. The Pony Express shut down two days later. But in its short life, it proved something important. A coast-to-coast mail system was possible. It also helped keep California connected to the nation before the Civil War.