Human migration occurred because of several factors. The reasons are the following:
1.food shortages
2.War
3 Seasonal changes
4.Disease and epidemic.
Africans are nomadic people. They thrive more from their environment. They only had to stop migrating during the agricultural era, wherein they learn to plant and tend crops and started cattle herding.
They were like coworkers, there not allies, but they know each other.
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.