he one government agency that still reaches nearly every American daily — undeterred by rain, sleet, snow or even gloom of night — turns 250 on Saturday.

Established in 1775, when the Second Continental Congress appointed Benjamin Franklin as postmaster general, the postal service predates the United States. It was launched nearly a year before the colonies declared their break from British rule.

“The country may not even have come into existence but for the Postal Service,” said Stephen Allen Kochersperger, the postal service historian and a former local postmaster.

While it now grapples with concerns over its financial viability in the modern era, the agency has had a long and colorful history that helped shape the nation. It has grown from serving the 13 colonies to delivering more mail than any other postal system in the world, reaching nearly 169 million addresses and employing more than 635,000 people.

Westward expansion

When the U.S. Constitution was ratified, Congress was granted power to establish post offices and mail routes that were first used by mail carriers on horseback and later upgraded for stagecoaches. Some evolved into highways still used today.

Initially running north–south along the East Coast, post roads later extended westward. Historians have said this aided settler expansion into Native lands and was intertwined with the displacement of tribes.

As western migration accelerated, mail was sent by ship from New York to Central America and on to California. Delivery typically took two to three months.

The Pony Express, operated by private carriers, was started to speed things up. A relay system of riders on horseback carried mail from California to Missouri, the furthest westward railroad stop. The 1,800-mile (2,900-kilometer) journey took 10 days.

While legendary, it only lasted about 18 months, until Oct. 26, 1861. The service was scuttled by the Civil War and made obsolete with the advent of the telegraph, said Daniel Piazza, chief curator of philately at the Smithsonian National Postal Museum.

Later, the transcontinental railroad reduced mail delivery from months to days.

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