I was just counting the number of schools in my 1967/68 Detroit Public School Directory. It numbered 325+. Seeing that number I could see a city with close to 2 million people.
As for people living close to factories. Back in the 20's cars were still a luxury and it was not always possible to use the streetcar. Now there are stricter laws when enforced that could have industry coexisting with residential, As well as agricultural.
Needless to say Close to 2 million or 2 million is 50 plus years past and I belive not likely in the next 50 years.
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