It started with a problem.
The U.S. Postal Service introduced free city delivery — mail carriers who delivered to homes rather than requiring recipients to collect at the post office — on July 1, 1863. Before this, urban residents paid to have mail held at the post office and retrieved it themselves. Free city delivery extended the reach of the postal network to the doorstep. USPS documents this as one of the transformative milestones in American postal history, noting that the free city delivery program made correspondence more accessible and drove growth in personal and commercial mail volume.
Historical sources below ↓Then something changed.
Free delivery changed the postal network from a point-to-point exchange system into a true distribution infrastructure. A business could now mail a catalog, an invoice, or an advertisement to a customer's home without requiring the customer to take any action to receive it. This passive reach — the ability to put information in front of a recipient who had not actively sought it — was the basis for direct mail marketing and mail-order retail. Rural Free Delivery, begun in 1896, extended this to farms and small towns. The combination of national coverage and home delivery made the postal system the first truly universal commercial distribution network in the United States.
What a builder can learn.
Our interpretation: infrastructure that reaches everyone enables commercial models that could not exist before it. The postal system reaching every home enabled Sears, Montgomery Ward, and later every direct mail marketer. The internet reaching most homes enabled e-commerce. For a business builder, the question is what infrastructure recently reached scale that enables a business model that was not previously viable — and whether the current moment is early enough in that adoption curve to build on it.
A door still open.
A hypothesis worth testing: if a small business identified one piece of recently scaled infrastructure — a platform, a network, a standard, a delivery service — and asked whether its current business model was using that infrastructure as fully as possible, would it find an underutilized capability that competitors were already exploiting?
What piece of infrastructure has recently reached scale in your market — and is your business model built around it, or still designed for the infrastructure that preceded it?
Follow the evidence.
History is sourced below. Business lessons are editorial interpretations; future possibilities are questions to test, not predictions.
Prepared from primary-source histories. First edition: 25 Sept 2026.