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"A large reason for this transformation is immigration. But the changes also reflect how the regional economy has changed, with the shrinking of the aerospace industry, which supported the once dominant, mostly white middle-class community here. That has largely been taken over by service, tourism and high-tech jobs, the result being that this county is a contrast of the extremely wealthy and the lower middle class."

In The New York Times, Adam Nagourney checks out Orange County, California.