environmental disaster in American history IMO.
The worst environmental disaster in American history from my side of the creek is the importation of the Asian Chestnut tree along with the parasitic fungus Endothia parasitica aka Chestnut blight.
In the early part of the twentieth century this parasite to which the magnificient American Chestnut, "the Redwood of the East" had almost no immunity, effectively caused this important economic and ecologically vital tree to become quite nearly extinct over 5 decades. Although rare specimins of the tree survive here and there, and there is an effort to restore most of the trees genes, the cultural, ecological, and economic cost of this disaster is incalculable.
That this event is largely forgotten does not mean that its costs were not greater.
http://ncnatural.com/NCNatural/trees/chestnut.htmlIn any case, people would rather not think about the Valdez. It interferes with the unadulterated joy they extend to their new cars.