Controlling for race, are suburbs different from what they once were?

[Badger]

One. Increased diversity. These collar counties now have significant African-American and Hispanic populations voting heavily democratic, as opposed to being nearly White in the '80s and even part of the 90s.

Two.  Increased antipathy of college educated voters, especially those with postgraduate degrees, to a Republican Party platform that stands for square in favor of global warming being a hoax, a base that opposes teaching evolution, believes that homosexuality and transgenderism are mental illnesses, etc etc.

Three. Some of these suburbs are starting to have Urban Decay creep from their Metropolitan center. A lot of ones middle class voters are working class and upper middle class barely middle class compared to a couple decades ago.