Before Electric Refrigerators, How Did Americans Keep Food From Spoiling?

#OldAmericanHomes #AmericanHistory Before 1963, the U.S. Post Office moved billions of letters using Railway Mail Service clerks who memorized complex routes and sorted mail on moving trains. Post-WWII suburban expansion, declining passenger rail, and skyrocketing mail volumes overwhelmed this human system, forcing the launch of the five-digit ZIP code in 1963. Despite initial public resistance, the ZIP code transformed mail routing from human memory to numerical automation, ultimately evolving into a powerful geographic tool for modern business, marketing, and data analytics. Subscribe for more deep dives into the forgotten systems, everyday life, infrastructure, labor, and hidden forces that shaped modern America.