The Rocky Mountain News reports:
The Cheyenne and Arapaho tribes of Oklahoma filed a claim Wednesday for 27 million acres given to the tribes in a 19th century treaty but said they would settle for 500 acres to build a casino in a symbolic return to Colorado.
The petition, filed with the Department of Interior, covers northeastern Colorado and about 40 percent of the state. The land claims include water rights on the Platte and Arkansas rivers that predate those of many water users today.