Sun Corridor projection: 9M population by 2040

For generations, Arizonans have talked about the potential merger of Phoenix and Tucson into a single urban area. The expectation was that they would blend together seamlessly, much the way Phoenix and Mesa did, or like the continuous metropolis now lining the nation’s East Coast. This has not happened. It probably never will happen, due to some of the realities Western cities face, such as the Indian reservations and public lands that lie between Phoenix and Tucson. More recently, researchers concluded that a physical merger may not be as significant as an economic one. The real question, they say, is ...

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