In my opinion, they settled where they did because it was a good spot to, they had water and places too far. There was also no hills or mountains. You cant build a house on top of a mountain so they did it on flat land next to the river or lake so they get water. they use that water to drink or for there crops to grow. They also have room to raise farm animals for food and clothing. They also settled there so they don't have to go far to the next person's house. these are just some reasons I think they settled there.