 The growth of the auto industry was reflected by changes in businesses throughout the Midwest and nation, with the development of garages to service vehicles and gas stations, as well as factories for parts and tires.Today, greater Detroit remains home to General Motors, Chrysler, and the Ford Motor Company.The Northwest Ordinance region, comprising the heart of the Midwest, was the first large region of the United States that prohibited slavery (the Northeastern United States emancipated slaves in the 1830s).