I would say Lebanon and Israel. the conflict would be that the lebanon is most likely to get less water because the Jordan River doesn't enter Lebanon. and since majority of the water is going to Israel, that will cause Lebanon to get angry with Israel and most likely to start a huge conflict between the two.
Many experts believe that all humans can be traced back to the continent of Africa, since migratory patters can be found from fossil evidence that then spread through Europe and Asia.
Answer:
Polytheism.
The rest only came way later on, Egypt is a dead giveaway of this answer as Egyptian Mythology is still greatly publicized in movies and other forms of pop culture.
