In May 2nd., 1890, the Organic Act for the Territory of Oklahoma provided a framework for Oklahoma's territorial government. Between 1890 and 1907, the population of Oklahoma grew from 60,417 to 722,441 people. This increase in population was most likely attributed to the Cherokee Comission, which Congress passed to convince the Native American tribes of the reagion to forfeit their land and move to pre-assigned living areas. The land that was now open was given to settlers with a federal lottery for land grants. In the history of white and Indian relations, this moment in time proves to be a step back. This is because the already displaced Indians were forced out of their new homes, while the new settlers were permitted their land with little to no cost.

http://digital.library.okstate.edu/encyclopedia/entries/O/OK085.html