Comparing our present to our past is how we understand our history. Arcadia's Past & Present series makes such local comparisons available. Books in this series offer a special view of American life by placing historical images side by side with contemporary photographs.Located along the West Branch of the Susquehanna River, Williamsport has a unique history. Two key economic expansions brought millions of dollars to the area, but devastating disasters took their toll on the city, resulting in multiple transformations over time.