I've had a scroll through and many of the answers seem to relate to the US, which doesn't show any evidence of undergoing decolonisation any time soon.
A better example is the Chilean constitution that was put to a referendum relatively recently, albeit unsuccessfully: its key features were recognition of Chile's plurinational status, with added rights for indigenous people and communities. Have a read about it here:
Bolivia has a plurinational system too, but I am not as familiar with it so can't vouch for it.
In any case, Latin America is where to look. From a brutal experience of colonisation and US/UK backed dictatorship to what is slowly becoming a recognition that justice needs to be done. They're way ahead of the west.