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They govern the mail, by Act of Congress, as enumerated in the Constitution.

That you don't seem to like the USPS or its operations doesn't make it not a government service.

Some countries have no government postal service, and some have no postal service at all, but the US clearly has a government postal service.

Yes, you should take the bus.

Driving to almost every US address? I'm not American, but I was under the impression that mail delivery people mostly walked their routes.