New York Times: Pittsburgh—This city has passed a grim demographic milestone: More people are dying here than are being born.

What demographers call a natural decrease has been occurring for years in tiny rural towns and in some retirement meccas in the South. But the phenomenon is relatively new in metropolitan areas in the Northeast, the Rust Belt of the Middle West and Appalachia.

In Pittsburgh, public school enrollment plummeted from about 70,000 two decades ago to about 30,000 and continues shrinking by about 1,000 a year.

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