Water flows through Navajo Canyon on Oct. 23 in Page, Ariz. In a lawsuit, the Navajo Nation had sought to force the federal government to do more to secure water for its reservation. (Joshua Lott/The Washington Post)
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The Supreme Court on Thursday rejected the Navajo Nation’s attempt to force the federal government to do more to secure water for its huge and arid reservation in the West.

In a 5-4 decision, Justice Brett M. Kavanaugh said an 1868 peace treaty between the United States and the Navajos does not require the federal government to take any “affirmative steps” to secure rights on behalf of the tribe to water from the Colorado River, which runs along part of the 17-million acre reservation that stretches through Arizona, New Mexico and Utah.