Why is the Fedarl government in charge of the post offices?

Answer 1

The establishment of a national post office was delegated to the federal government for the same reason the patent office was delegated. The reason was that under the so-called commerce clause the federal government was tasked with 'regulating' commerce among the States, with the intention of preventing tariffs and barriers to trade. One of the best ways to facilitate trade is to establish patent protection and facilitate communications, hence the post office. The authority delegated in the commerce clause was never intended to be used to produce regulations of any kind for trade among the States.

Answer 2

With one authority regulating the postal service, it ensures that rates are continuous throughout all states and territories of the US, and it allows the USPS to remain one single service, rather than a conglomeration of 50+ different postal services.

Answer 3

It sort of makes sense that the postal system - which serves every state and territory of the US - would be federally controlled and regulated. Think of how much more time it would take if each state had an independent postal system, and how much more of a strain it would be on the state budgets.