I think that the best answer is Middle East: among the earliest metal tools were tools from Egypt, and also Hittites were early tool makers, some early works were also done in Iran.
The Inca's were the native civilization conquered by the Spaniards.
https://www.quora.com/Why-did-the-Roman-public-not-like-Julius-Caesar
Why did the Roman public not like Julius Caesar? - Quora
https://www.history.com/.amp/topics/ancient-history/julius-caesar
Julius Caesar - Play, Quotes & Death - HISTORY
https://www.khanacademy.org/humanities/world-history/ancient-medieval/roman-a/a/roman-empire
The Roman Empire (article) | Khan Academy
The best option regarding a direct cause of job specialization in early human civilizations would be "<span>a. Development of agriculture," since this meant that there was a surplus of food--meaning that people could focus on things other than obtaining and growing food. </span>
