It's not just inner-ring suburbs. Trump has also underperformed in key exurban counties during the GOP primaries.

Tech Insider : Politics, Economy
Trump
Former President Donald Trump speaks at a campaign rally.

AP Photo/Chris Carlson

How millennials could give the suburbs a much-needed makeover

Tech Insider : Economy, Politics
Modern row houses in the suburbs of Delaware.
Modern row houses in the suburbs of Delaware.

Joe Sohm/Getty Images

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