Pipeline opponents say Trump's executive order tramples tribal sovereignty

The Army Corps of Engineers gave remaining Dakota Access Pipeline protesters until 2 p.m. on Feb. 22 to leave Standing Rock in North Dakota, ending what protesters said was a short-lived victory for Native American sovereignty and self-determination.

Before President Donald Trump’s inauguration, the Army Corps of Engineers agreed to look for alternative routes for the controversial pipeline, which for the past several months has drawn thousands of protestors to the edge of the Standing Rock Sioux Tribe reservation near Cannonball, North Dakota.  

http://universe.byu.edu/2017/02/23/trumps-executive-order-tramples-tribal-sovereignty/