[Emedgella]

Movement from nation to nation has been quite simple in Europe for decades.

But, I don't see why it would be necessary, assuming the union remained in place.

As to immigration problems, they are easily solved, but they are not solved at any border.

You said it would be OK if the states had different immigration laws, so an illegal could be allowed to stay in Cal, but would be subject to deportation in Az. the ony way to enforce such different state laws would be to check everyone at the border.

you just need to think your ideas all the way to their logical conclusion before writing them down.