You seem to want not a nation of 50 states, but 50 completely independently sovereign nations which will somehow miraculously also agree to cooperate on the handful of things that you personally feel they should.
This has been tried, and failed, and was replaced with the Constitution we have now.
> which will somehow miraculously also agree to cooperate on the handful of things that you personally feel they should
That's what the constitution is for... it states what the Federal Government does... everything else SHOULD be state issues.
Those clearly drawn lines have been eroded over the years and is one of the larger points of contentions between the "Constitutionalists" who think that we should have a government actually limited by those rules... and those who think the government has all the answers and should have no limit