Artwork for the Al Jazeera documentary Standing Rock & The Battle Beyond

For months, Native Americans have been protesting the Dakota Access oil pipeline, a multi-billion-dollar construction project that tribal leaders say is threatening sacred sites and a vital source of drinking water.

The Standing Rock Sioux tribe says the federal government failed to consult with them before issuing permits for the pipeline. Protests against the project have been growing since April, with thousands of people -- including tribes across the U.S. -- joining historic demonstrations in support of the Sioux.  

In December, the Obama administration handed them a victory, ordering the project to be halted and re-routed.

But the election of Donald Trump has cast doubt on that decision, and the company in charge of constructing Dakota Access says it isn’t backing down. Fault Lines reports on the battle for tribal sovereignty – and whether treaties guaranteeing Native American land rights are being violated for corporate gain.

Standing Rock & The Battle Beyond screens on Al Jazeera English on 30 December at 18:30.