Their belief was based on a clause in the Homestead Act of 1862 which said that any settler could claim 160 acres (0.65 km2; 0.25 sq mi) of "public land.
"[1] The land was said to be public because it had been set aside for Indian reservations, yet the allotment for some tribes was reduced as a result of allying with the Confederacy during the Civil War and the Reconstruction Treaties that followed.
[2] Charles C. Carpenter was the earliest leader of the Boomer movement, but was eventually succeeded by David L. Payne.
After its founding in 1890, the University of Oklahoma adopted "Boomers" as the nickname of their football team, after having first tried "Rough Riders."
The OU "mascot" is the Sooner Schooner, a Conestoga wagon that crosses the field when the University of Oklahoma football team scores.