<span>As a result of the Persian Wars of the 5th century B.C. </span>Athens took the lead in organizing the alliance of Greek city-states against further attacks by the Persian Empire
The industrialization created a north that wasn’t dependent on agriculture (farms) for their main source of income, thus they wouldn’t need said slaves to farm and the slavery industry wasn’t seen as a necessity. While the south who had a warmer climate allowed for more farms so they had been slow to industrialization and free labor ( slavery) was very convenient
