<span>They started because the Persian Empire expanded into Ionia where there were several Greek colonies. The colonists sent back to Greece for help. The Athenians sent a few ships to help the colonists, but the cities were taken any way. To put the mainland Greeks in their place, the Persians sent a small force to punish the Greeks. So begins the battle of Marathon. </span>
Didn't they have to move to a place where to could plant, or they had to plant other things that would sell fast.
The impact was that they were trying to steal the other person's land
