[2] The interstate agreement that the case centered around, the Rio Grande Compact, arose from multiple concerns regarding apportionment of water during the early 20th century.
[3] As part of its efforts to develop the arid American West through the Newlands Reclamation Act and the Rio Grande Project, the federal government began construction of the Elephant Butte Reservoir in New Mexico to reserve a large amount of water for transference to Mexican officials; the reservoir was completed in 1916 and soon found additional use supplying farmers in New Mexico and Texas with water for irrigation of their crops.
[4][3] However, a lack of regulation regarding water apportionment between the states caused tension between Colorado, New Mexico, and Texas, leading them to sign the Rio Grande Compact in March 1938, which committed all three states to equal division of the Rio Grande's water supplies above a point in Fort Quitman, Texas.
[2] Justice Neil Gorsuch delivered the Court's unanimous opinion, holding that the federal government has the right to join suits in matters related to interstate compacts provided that the compacts at hand are directly related to the operations and obligations of the federal government.
[2][4][6] Notably, the justices chose not to rule on the issue of whether the federal government has the right to initiate a unique suit regarding proper adherence to interstate compact law.