The Sooner State
Oklahoma's nickname is The Sooner State.
"On April 22, 1889 the unassigned lands of the Indian Territory (later called Oklahoma Territory) were opened to settlers. Thousands of people lined up on the border and, when the signal was given, they raced into the territory to claim their land. Some people went in early to stake claims. They became known as Sooners." (quote from Answers.com).