The term "Sooners" refers to settlers who entered the Oklahoma Territory before the official opening date of April 22, 1889. These individuals took advantage of the land rush, claiming plots of land for farming and settlement. The name "Sooner" originated from those who illegally crossed the border into the territory to stake their claims early. The Land Run of 1889 marked a significant event in American history, as thousands of people rushed to claim land in the newly opened territory. The actions of the Sooners led to legal disputes and changes in land policies, shaping the development of Oklahoma and its communities.