Maybe a serial nomination would be better?
Here is a list of National Historic Landmarks in Michigan that are connected to the Early Automobile Industry.Ford Ford Piquette Avenue Plant
(Detroit) - This production plant was the initial factory for the Ford Motor Company. Built in 1904, it was where the original Model T Ford was first designed and produced, and is the factory that earned Henry Ford his position in the American automotive industry.Highland Park Ford Plant
(Highland Park) - Under construction from 1909 to 1920, the Albert Kahn-designed plant is thought to be the "birthplace of the moving assembly line".Ford River Rouge Complex
(Dearborn) - This complex, mostly constructed between 1917 and 1927, was where Henry Ford first achieved continuous work flow in the production of automobiles. It is considered "one of the industrial wonders of the world".General MotorsDurant-Dort Carriage Company Office
(Flint) - was instrumental in the promotion and financing of the carriage and automobile industries, including lending to both Buick and General Motors during their start-up periods.General Motors Building
(Detroit) - Completed in 1923, this is the oldest extant headquarters of General Motors in Detroit. This building symbolizes one of the largest manufacturing corporations in the world.General Motors Technical Center
(Warren) - Eero Saarinen's International Style research center for the automaker was completed in 1955. It has been praised as one of the best industrial buildings of its era.
This heritage is often colloquially called or recognized in the region as "MotorCities National Heritage Area