Photos by Hannah Yoon. Words by Patricia Cohen The Lehigh Valley rebuilt its economy after foreign competition wiped out its mills. Now good times and bad memories may both help the president. The economic renaissance has been more than a decade in the making in this eastern stretch of Pennsylvania, and it has much to do with location, luck and local leaders.“It’s transcended presidents and administrations,” said Don Cunningham, the president and chief executive of the Lehigh Valley Economic Development Corporation, a public-private partnership. In the last five years, employers created 26,000 additional jobs. “It began under Obama and continued under Trump,” he said.