Notable events in the dispute over the four-state, $3.8 billion Dakota Access oil pipeline.
December 2014 — Dallas-based Energy Transfer Partners applies to the federal government to build the 1,200-mile Dakota Access pipeline to carry North Dakota oil through South Dakota and Iowa to an existing pipeline in Illinois. The pipeline is projected to carry half a million barrels of oil daily. The proposed route skirts the Standing Rock Sioux tribe's reservation and crosses under Lake Oahe, a Missouri River reservoir in North Dakota that serves as the tribe's drinking water source.
March 2016 — Iowa regulators approve the pipeline, making it the fourth and final...