The Industrial Revolution didn't just happen in factories — it happened between them. The canals and turnpikes that stitched Britain and America into integrated markets were the circulatory system that let industrialization scale.
Pre-canal land freight cost 10–15× more per ton-mile than water transport. The Bridgewater Canal (1761) cut Manchester coal prices 50% overnight. The Erie Canal (1825) dropped New York–Buffalo freight from $100/ton to $10/ton. Cheaper inputs + wider markets = profitable mass production.
Regions could now specialize: Lancashire cotton, Pittsburgh steel, Chicago meatpacking. Adam Smith's "extent of the market" limit expanded from walking distance to canal reach. Division of labor deepened. Factories grew from dozens to thousands of workers.
Canal and turnpike companies pioneered corporate finance — shares, bonds, dividends. The Erie Canal's $7M cost was funded by state bonds sold to European investors. Returns funded more infrastructure. This financial infrastructure enabled railroad capitalization later.
Canals linked coal to iron ore (Coalbrookdale), cotton to mills (Manchester), grain to ports (Chicago). Without bulk transport, resources stranded at source. The Middlesex Canal brought New Hampshire granite to Boston; the Chesapeake & Ohio Canal brought Appalachian coal to Georgetown.
Transport demands drove engineering: better locks, aqueducts, inclined planes, then steamboats, then locomotives. The Liverpool & Manchester Railway (1830) was born from canal congestion. Transport was the first high-tech industry.
Workers migrated to factory towns along transport corridors. Manchester grew 10× (1770–1850). Chicago exploded from 4,000 to 300,000 (1840–1870) via canal/rail nexus. Concentrated labor enabled factory discipline and unionization.
Roads and canals didn't just serve industry — they created the spatial logic that made industrialization profitable, scalable, and self-reinforcing. The factory was the heart; transport was the blood.