With US not having centralized vital records registry and also not having demographyc registry and not issuing id cards out of principle -- it's pretty easy to

With US not having centralized vital records registry and also not having demographyc registry and not issuing id cards out of principle -- it's pretty easy to have consistency issues on the scale of millions. Add the fact that people also move to other countries and US government may not even know somebody died, because death was not reigistered in US.