Sooners is the name given to settlers who entered the Unassigned Lands in what is now the state of Oklahoma before the official start of the Land Rush of 1889. The Unassigned Lands were a part of Indian Territory that, after a lobbying campaign, were to be opened to American settlement in 1889. President Benjamin Harrison officially proclaimed the Unassigned Lands open to settlement on April 22, 1889. As people lined up around the borders of the Oklahoma District, they waited for the official opening. It was not until noon that it officially was opened to settlement. The name derived from the "sooner clause" of Proclamation 288 — Opening to Settlement Certain Lands in the Indian Territory, which stated that anyone who entered and occupied the land prior to the opening time would be denied the right to claim land. The designation "Sooner" initially had a very negative connotation. While "Boomers" were merely expressing "pioneer spirit" in their desire to take and settle formerly Indian territory, Sooners were essentially stealing from other white settlers by cheating on the claim requirements to get better land. However, these negative connotations rapidly cooled as time passed after 1889 and land claims were settled. By the time of statehood, Sooner had become an affectionate term for Oklahomans as a whole with a whiff of rebellion. In 1908, the University of Oklahoma football team adopted the nickname "Sooners". The U.S. state of Oklahoma has been popularly nicknamed the "Sooner State" since the 1920s. Characteristics Sooners were often deputy marshals, land surveyors, railroad employees, and others who were able to legally enter the territory early. Sooners who crossed into the territory illegally at night were originally called "moonshiners" because they had entered "by the light of the moon." These Sooners would hide in ditches at night and suddenly appear to stake their claim after the land run started, hours ahead of legal settlers. Relationship with Boomers The term Boomer relating to Oklahoma refers to participants in the "Boomer Movement," white settlers who believed the Unassigned Lands were public property and open to anyone for settlement, not just Native American tribes. Their reasoning came from a clause in the Homestead Act of 1862, which said that any settler could claim of public land. Some Boomers entered and were removed more than once by the United States Army. Those who actually observed the official start of the land