Complete the following sentence: On March 24, 1989, the oil tanker Exxon Valdez ran aground on Bligh Reef, spilling eleven million gallons of crude oil into the waters of Prince William Sound. <unk> <unk> <unk>
Exxon Valdez oil spill was the largest in United States history.<unk> Exxon Valdez oil spill was the largest in United States history.