BOOMERS- These were settlers in the southern states who atttempted to enter the unassigned lands. This unassigned land is now known as Oklahoma. This happened in 1879, before President Grover Cleveland opened them to settlement. Cleveland opened them to settlement by signing the Indian Appropriations Act of 1889. The Act was signed on March 2, 1889.
SOONERS- People settling on land in the early West before its official opening to settlement. These people did this because by law, the first settler who got there before official opening, could own the land due to prior claim.
Boomers and Sooners were different, because boomers only attempted to enter unassigned land, while Sooners went to the land to claim it before it was even available.
A Sooner is also known as a native or a resident or Oklahoma.
A Boomers belief was based off of the Homestead Act of 1862, which said that any settler could claim 160 acres of land.