On 22 April, the U.S. opened Oklahoma to white settlement. Within 24 hours claims for million acres were staked by over 50,000 settlers.
Editors. "Native American land in Oklahoma given to white settlers". The Literary Encyclopedia. First published 01 February 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5348, accessed 28 May 2015.]