who has the power to establish post offices
Postal Clause Article I, Section 8, Clause 7 of the United States Constitution, known as the Postal Clause or the Postal Power, empowers Congress "To establish Post Offices and post Roads".[1]
The Post Office (play) Amal stands in Madhav's courtyard and talks to passers-by, and asks in particular about the places they go. The construction of a new post office nearby prompts the imaginative Amal to fantasize about receiving a letter from the King or being his postman. The village headman mocks Amal, and pretends the illiterate child has received a letter from the king promising that his royal physician will come to attend him. The physician really does come, with a herald to announce the imminent arrival of the king; Amal, however, dies as Sudha comes to bring him flowers.