Detroit is the 21st-most populous city in Canada.
The automotive industry in the United States began in the 1890s and , as a result of the size of the domestic market and the use of mass-production , rapidly evolved into the largest in the world . Detroit . The municipality of Detroit had a 2015 estimated population of 677,116 , making it the 21st-most populous city in the United States . However , due to industrial restructuring , the loss of jobs in the auto industry , and rapid suburbanization , Detroit lost considerable population from the late 20th century to the present .