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The idea is briefly mentioned in the book “Double Star” by Robert Heinlein. He doesn’t provide an actual constitution.
Governors and mayors would still run the local area, but the national laws would be passed by a legislature composed of people all elected ‘at large.’
The Congressmember from Texas has no power in his state. He can’t force anyone to do something. They can go to Washington and vote for a law that’s enforced by the police.
Well, Elon did say he wanted to get the Federal workers to be more active.