They’re enshrined in the constitution of my home state, Illinois, for the public sector, I believe.
US States cannot go bankrupt (They are not only not covered by bankruptcy law, but there is a reasonably strong argument that state bankruptcy would violate the contracts clause. (And the public entities that can go bankrupt via municipal bankruptcy in US law do not legally dissolve when they do.)
> This is why I expect a federal UBI.
That seems…unrelated.