Susan Montoya Bryan, Associated Press

The Trump administration is initiating formal meetings with tribes in the Southwest as it considers revoking a 20-year ban of oil and gas development across of hundreds of square miles of federal land surrounding Chaco Culture National Historical Park.

Organizers of North America's largest powwow announced the end of the more than 40-year-old Gathering of Nations Saturday.

Clouds start to build in the early afternoon and the air becomes sweet with the promise of rain. The monsoon season is ramping up across the southwestern United States.