The #NoDAPL movement drew worldwide attention as protestors and police descended on North Dakota.
Opponents quickly outlined plans for lawsuits, political pressure and street action.
“You can’t drink oil. Keep it in the soil," marchers chanted.
Authorities say they arrested 46 people during their second day raiding Oceti Sakowin.
A few protesters who refused to leave remained at the site Thursday.
“As much as this is an ecological crisis, it is a moral failing of our society," one protester said.
The decision, a defeat for environmentalists and the Standing Rock Sioux, is likely to be challenged.
Let me tell you something about the Great Sioux Nation. This is a Native American people that settled the upper Great Plains
“Basically, it’s an act of war,” a Sioux leader says.