The Hellenistic civiliaztion was a time period where all of the countries Alexander the Great captured began doing everything the Greek way.
This answer depends on what successful means. If it means how long it lasted, then China is the most successful civilization following by the Byzantine empire. In terms of contributions to science,...
No all of them died out but some where better than others.
They lived near the Nile river so they could get surplusses of food which allowed them to create specializations of labor.
by working together