I've read a book called Four Hundred Years In America before; I don't know if its English version is popular. It points out that one core reason for the South's

I've read a book called Four Hundred Years In America before; I don't know if its English version is popular. It points out that one core reason for the South's defeat in the Civil War was how vital the cotton trade between the American South and Britain was to both sides. So the North used their fleet to blockade the South's cotton exports to Britain right away, leaving the South without the trade revenue to import steel and other materials needed for building railroads—basically sealing their fate. Britain just pivoted to sourcing cotton from places like India, still not relying on local production. This example really drives home how Britain's industrial foundation was way too dependent on raw material inflows from the colonies.