What's your favorite design system history date? Two of my most oft cited are:
Design Tokens written about by Salesforce, 2014
Google Material docs site visible by public, Fall 2014
Design Tokens written about by Salesforce, 2014
Google Material docs site visible by public, Fall 2014
Comments
For all you that think design systems started in the 2010s or later, check out the decision trees and flows here.
https://boxesandarrows.com/implementing-a-pattern-library-in-the-real-world-a-yahoo-case-study/