I don't think this is quite right. The Postal Clause give congress the power to establish the USPS. It doesn't mandate that they do so. If Congress decided the

I don't think this is quite right. The Postal Clause give congress the power to establish the USPS. It doesn't mandate that they do so. If Congress decided the USPS was no longer necessary (not a position I advocate), they would be well within their rights to pass a law abolishing it.