At War Over Water, Texas and New Mexico will face off next week at the Supreme Court.

In 2008, the Federal Bureau of Reclamation and irrigation districts in Las Cruces, New Mexico and El Paso signed a new agreement to share water during droughts. But soon after, New Mexico sued Texas, claiming it was losing too much water under the deal. Then in 2013, Texas filed its own lawsuit, saying New Mexico was allowing its residents to overpump groundwater connected to the river. This is the case that’s headed to the Supreme Court on January 8.