In the second half of the twentieth century, pro-union and anti-trade policies led to a Rust Belt that became uncompetitive, costly, and unable to cope with reality. More protectionism won't save the region now.
The geographical isolation of a reservation, and the tribal commitment to investment in a casino, energy extraction, and other enterprises can have a sizable impact on the incomes of reservation residents.
Conservatives tell us that we must move beyond the idea of allowing people to trade freely in the marketplace. "Patriotism" is the true measure of economic policy, and that requires higher taxes, more government spending, and a powerful state.