"Sovereign" means powerful. It can mean being specifically more powerful than others, having power over others, but it can also mean being independent, that is not having to answer to anyone else. A sovereign group is a group with either of those two properties.
The nile river the gift of Egypt would be described as:-
Every year between June and September there would be a rainy season called Akhet- the inundation and would usually flood the river and Melting snow and heavy summer rain from the Ethiopian Mountains would come tormenting down to the river on the flat desert land. (Hope this helps).
Overlapping authority is when one individual is rewarded on a different and conflicting basis from another individual. This is the third model in Deil Wright's Overlapping model where he sees that it the important way of predicting or knowing relationships especially political matter.<span />
