PHILADELPHIA, Pennsylvania (WPVI) — It’s moving day for the SS United States! The historic ocean liner has begun its journey down the Delaware River on its way out of Philadelphia on Wednesday.

National environmental reporter David Schechter and a team of CBS journalists spent five days traveling the length of the Delaware River to explore problems facing America's waterways. Watch "An ...

Robb said George Washington's crossing of the Delaware River, and subsequent attack of the British camped in Trenton, New Jersey, in 1776, was critical to the founding of the United States.