Nice illustration of how canals and river navigations opened up Britain's economy, forging it into a single domestic market. Shaded bits show the land more than 15 miles from sea or navigable river, and thus reliant on more expensive overland transport. Huge change 1600 to 1760. pic.twitter.com/owGEj50Baj
— Dr Anton Howes (@antonhowes) July 20, 2020
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