These can be some shared characteristics by civilizations:
Big population centers: These help people survive with the
help of each other, like farmers can grow and sell in these areas etc.
Monumental Architecture or Art: This will be identified as
their legacy
Record Keeping: This can be a language or any other recording
system to help record the history and traditions.
System of administering areas: Help run the place smoothly.
Labor division: Various people are skilled at various jobs,
to do a certain job a skilled laborer is required.
Social Class System: It can be based on wealth as well as
the type of work performed.
