Fifty different tribes and First Nations from the United States and Canada have signed a continent-wide “Treaty Alliance Against Tar Sands Expansion,” committing to a unified fight against the construction of pipelines in their territories. The proposed pipelines include Keystone XL, Enbridge Line 3, Kinder Morgan, Energy East and Enbridge Northern Gateway pipelines. The treaty means that dozens of First Nations in Canada, as well as the Standing Rock Sioux Tribe in North Dakota and the White Earth Nation in Minnesota, have now legally barred these pipelines from crossing their lands.