The evolution from leather-soled shoes of the 19th century to the sneakers people wear today started slowly, then built momentum. Many of the big names in sneakers today got their start surprisingly early in the process.
Research:

Unearthed! In July 2026, Part 2
45:21

Unearthed! In July 2026, Part 1
41:36

SYMHC Classics: Raincoats
39:10