The U.S. vs. Texas case was a landmark Supreme Court decision that addressed the issue of state sovereignty and federal authority in relation to the United States' power over the states. The case involved a dispute over land ownership in Texas, specifically regarding the Red River and its adjacent lands. The Supreme Court ruled in favor of the United States, establishing the principle that the federal government had the authority to resolve disputes between states and to regulate interstate boundaries. This decision reinforced the supremacy of federal law over state law in matters of interstate conflict and highlighted the federal government's role in preserving the unity of the nation.