While tribal nations do not enjoy direct access to U.S. courts to bring cases against individual states,
Ah, how could I neglect the lead statement?
The FACT is because the states are sovereign and the tribes are NOT, but are federal WARDS.
Your arguments are based on false assumptions, or to be not politically correct otherwise known as lies.
Tribal sovereignty describes the right of federally recognized tribes to govern themselves and the existence of a government-to-government relationship with the United States. Thus a tribe is not a ward of the government, but an independent nation with the right to form its own government, adjudicate legal cases within its borders, levy taxes within its borders, establish its membership, and decide its own future fate. The federal government has a trust responsibility to protect tribal lands, assets, resources and treaty rights.
Everyone's entitled to their own opinions, but not their own facts.