What are the requirements to be able to know that a group of people are civilized?
On "civilized" on a personal sense, this letter summarizes it: https://www.forbes.com/sites/bruceupbin/2013/07/29/8-things-civilized-people-do-by-anton-chekhov/#370bb37750de
Civilized on a national sense...The Five Key Elements of Civilization are: Centralized Government, Organized Religion, Job Specialization and Social Classes, Arts, Architecture, and Infrastructure, and Writing.