There is a county in Michigan called Wayne County. It holds Detroit. It has consistently given Democrats majorities of its vote since 1932.
Why has this county been voting Democrat for so long? Was it the union support? Was it that Detroit (or Wayne County) came up with the concept of being strong partisans on a mass scale before anyone else?
I think it is ideological. But that doesn't make much sense because ideology and party weren't so linked until the 80s or 90s or so. I say so because from 1896 to 1928, Republicans won the county, or at least got more votes than the Democrat. The wins from 1904 to 1924 were huge. This was following the explosion of people moving there for jobs in the then new automobile industry.
Why did Wayne County support Democrats for so long, even during Republican landslides like 1972?