… Half Of Oklahoma Is Native American Land.” The other four … discovery” directly to undermine Native Americans‘ land rights. … Because of this trusteeship, Native Americans cannot mortgage their land … the dignity that Native Americans once had and deserve …… Half Of Oklahoma Is Native American Land.” The other four … discovery” directly to undermine Native Americans‘ land rights. … Because of this trusteeship, Native Americans cannot mortgage their land … the dignity that Native Americans once had and deserve …