President Trump is reported to be revoking California's Clean Air Act exemption. Trump tweeted on September 18, 2019 that he was doing so. Since 1970, California has restricted automobile emissions more than most other states.
13 other states have established automobile emission standards that are effectively, "You can sell a new car in this state if, and only if, California says it is okay to sell the car in California." In 2017, Green Car Reports listed the 13 states as Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont, and Washington. Washington, D.C. also shared this policy.
If the Trump administration is successful in voiding California's power to establish stricter standards for automobile emissions and fuel economy, will this change automatically force the other 13 states to follow the federal standards?