Look at all these fake news stories saying that the Supreme Court
Here's a story that actually gives you accurate details:
https://kuow.org/stories/supreme-court-rules-that-about-half-of-oklahoma-is-indian-land
The ruling will affect lands of the Muscogee and four other Oklahoma tribes with identical treaties. Civil court issues are also affected.
It's important to note that the case concerned jurisdiction, not land ownership.
Ruling that these lands are in fact reservations "doesn't mean the tribe owns all the land within the reservation, just like the county doesn't own all the land within the county. In fact, it probably doesn't own very much of that land," Washburn explained. "That's not what a reservation is these days."
Washburn compares a reservation to a county — terms that describe jurisdictional boundaries.