Every other developed country in the world has postal banking, and we actually did too. It is important to remember this forgotten history as we begin to talk seriously about reviving postal banking because the system worked and it worked well. Postal banking, which existed in the United States from 1911 to 1966, was in fact so central to our banking system that it was almost the alternative to federal deposit insurance, and served as such from 1911 until 1933. The system prevented many bank runs during a turbulent time in the nation’s banking history—essentially performing central banking functions before the Federal Reserve was up to the task. Postal banking helped fund two world wars and reduced a massive government deficit after the Great Depression.
Baradaran, Mehrsa, "A Short History of Postal Banking" (2014). Popular Media. 201.