the geographical feature that served as a barrier to political unity and essentially created the Greek city stated was the mountains, specifically the Pindus Mountains, a range of Dinaric Alps that stretch South from Albania and Macedonia.
I believe the answer is: artificial intelligence (AI)
Currently, machineries have replace a lot of jobs that usually done by humans. But all of those only the jobs that are repetitive and simple. artificial intelligence (AI) on the other hand is capable to perform complex decision making like humans do (even better than most people).
Surplus and time
Hope this helps
Answer:
True, I believe because New York because was one of the first cities in the US. I could be wrong though, but I don't think I am :)
Slaves worked not as hard, ran away, rebelled against their masters, did not do what they were supposed to, etc.