Why can the exchange of "envoys" be considered a major development in ancient egypt?

Envoys can  be considered a  major development in ancient Egypt because  the  transportation   of a mail carrier /messenger is a step forward of improvement towards  finding   new ways to improve their community.  Also, by having an envoy, you can get news faster to you and important  information

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states