How did our health insurance become tied to our employer?

Ever wonder how the U.S. health insurance system evolved into this system that largely ties health insurance to your employer?  Most other countries do not have this employer-based insurance system.  The New York Times published a great summary of how we got where we are today: https://mobile.nytimes.com/2017/09/05/upshot/the-real-reason-the-us-has-employer-sponsored-health-insurance.html