Organization of Post Offices throughout the world that processes standard packages called Express Mail Shipments (EMS).
Established in 1874, the U.P.U. successfully established one set of international postal rates. Before this time, it was possible to send mail to a destination using a variety of postal rates using different postal routes as defined by a variety of different postal agreements in effect.
an organization, founded in Berne, Switzerland in 1874 to regulate and standardize international postal usages and rates