Despite several months of heavy opposition, an oil pipeline slated to cut through four Midwestern states has all the regulatory permits it needs for full build-out. The U.S. Army Corps of Engineers gave the final blessing to the Dakota Access pipeline on Tuesday. Developers now have the last set of permits they need to build through the small portion of federal land the line crosses, which includes major waterways like the Mississippi and the Missouri rivers. The so-called Bakken pipeline goes through mostly state and private land in North Dakota, South Dakota, Illinois, and Iowa. It received the last state permit in March. Construction has been ongoing in some areas, although some landowners have pending court cases as they object to the eminent domain powers the company got.