South Dakota et al. v. United States et al.

Opinion summary

Etalia.ai summary of the majority opinion

The case involved a dispute between the state of South Dakota and the United States over jurisdictional authority on Native American reservations. The primary issue was whether certain lands within reservation boundaries, which had been opened to settlement by non-Indians under federal law, remained subject to state taxation and regulation or if they were exempt due to their status as Indian country. The Supreme Court ruled in favor of the United States, affirming that these lands retained their designation as Indian country despite being settled by non-Indians. This decision reinforced federal authority over such territories and limited states' rights regarding taxation and regulatory powers on reservation land.