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.
Citation:
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 19 June 2013.]