Answer:
advances in tool making technology led to advance in agriculture and farming revolutionized the world and set prehistoric humans on a course toward modernity inventions such as the plow helped in planting of seeds. no longer did human have to depend on the luck of the hunt.
I believe it was Justinian that managed to unite Rome, and expanding the Byzantine Empire.
Both were huge into the business industry, Carnegie was a leader in the steel industry as well.
