 During a great immigration to the eastern Pennsylvania counties of the late 1900s from New Jersey and New York, the population expanded significantly.Developers from the New Jersey area were responding to tighter controls and regulations on new construction in the state of New Jersey by moving their enterprises to Pennsylvania.This new expansion and housing boom was enabled by the local completion of the interstate system of highways, first begun by former U.S. President Dwight Eisenhower in the 1950s.