Apr. 22nd 1889 at high noon was the start of the Oklahoma land run. Land that had been given to the Native Americans was now being reallocated for the white man. It was a race to pick out your spot. 160 acres were given for farm land and I'm not sure what the size of town lots were. People hid in the woods and arrived long before those who were fairly entering the competition. People would grab your land if you left it to go to the river and gather some water. In reality it wasn't a simple solution and after a few weeks more people were leaving the area than were arriving. In the end the area was built up and cities and towns were formed.
Online I've found a source that gives an interesting aspect to this land run. Oklahoma Land Rush of 1889 check it out if you'd like to know more about the event.