Because these areas have tribal sovereignty what proposal was approved by 51.51% of the voters on November 5, 1996 by the state of Michigan?
Michigan Gaming Control and Revenue Act: The Michigan Gaming Control and Revenue Act, passed by Michigan voters in 1996 as Proposal E and then expanded and signed into law as the Public Act 69 of 1997, allows non-Native American casino gaming in Michigan. Michigan Gaming Control and Revenue Act:  The proposal was approved by 51.51% of the voters on November 5, 1996. Native American gaming:  Because these areas have tribal sovereignty, states have limited ability to forbid gambling there, as codified by the Indian Gaming Regulatory Act of 1988.
Michigan Gaming Control and Revenue Act