Near Cannon Ball, N.D. — It is a spectacular sight: thousands of Indians camped on the banks of the Cannonball River, on the edge of the Standing Rock Sioux Reservation in North Dakota. Our elders of the Seven Council Fires, as the Oceti Sakowin, or Great Sioux Nation, is known, sit in deliberation and prayer, awaiting a federal court decision on whether construction of a $3.7 billion oil pipeline from the Bakken region to Southern Illinois will be halted.

The Sioux tribes have come together to oppose this project, which was approved by the State of North Dakota and the United States Army Corps of Engineers. The nearly 1,200-mile pipeline, owned by a Texas oil company named Energy Transfer Partners, would snake across our treaty lands and through our ancestral burial grounds. Just a half-mile from our reservation boundary, the proposed route crosses the Missouri River, which provides drinking water for millions of Americans and irrigation water for thousands of acres of farming and ranching lands.

Our tribe has opposed the Dakota Access pipeline since we first learned about it in 2014. Although federal law requires the Corps of Engineers to consult with the tribe about its sovereign interests, permits for the project were approved and construction began without meaningful consultation. The Environmental Protection Agency, the Department of the Interior and the National Advisory Council on Historic Preservation supported more protection of the tribe’s cultural heritage, but the Corps of Engineers and Energy Transfer Partners turned a blind eye to our rights. The first draft of the company’s assessment of the planned route through our treaty and ancestral lands did not even mention our tribe.

The Dakota Access pipeline was fast-tracked from Day 1 using the Nationwide Permit No. 12 process, which grants exemption from environmental reviews required by the Clean Water Act and the National Environmental Policy Act by treating the pipeline as a series of small construction sites. And unlike the better-known Keystone XL project, which was finally canceled by the Obama administration last year, the Dakota Access project does not cross an international border — the condition that mandated the more rigorous federal assessment of the Keystone pipeline’s economic justification and environmental impacts.