The Supreme Court’s twin rulings underscore a pivotal recalibration of U.S. governance, reinforcing the primacy of federal authority and placing new constraints on state-driven regulatory efforts. For California, the climate ruling could force a significant reconsideration of its ambitious push toward an all-electric future. On a national scale, these decisions suggest a judiciary more willing to intervene when state policies collide with federal law—reshaping the future of environmental regulation, energy policy, and immigration enforcement across the country.