Th e Oklahoma Land Rush - A gunshot fired. A cannon roared. Horses startled and wagons sprang to life. On April 22, 1889, settlers flooded into the region of central Oklahoma known as the Unassigned Lands. President Benjamin Harrison signed a proclamation on March 23, 1889, opening the land and people came from across the country to claim it. According to the Homestead Act of 1862, if a settler could stay on the land he claimed for five years and improve it, it would be his free and clear.