the haden expedition resulted in creation of the national park system. yellowstone the first.illi now theron se are over 4,000 world wide.ro antectedd over 2 million square miles of pristine nature that are protected from destruction. those are some big boots to fill. but i m walking in the shadow of the pioneers. following thtwo joure trail they blazed as detailed in two journalists kept[livel by the expedition and 10 laters that haden, him self wrote. does yellowstone look the same today as they described in the journals 150 years ago? let s find out.