The land of Egypt is found within the regions of northern Africa. Nubia, on the other hand, is located along the Nile river which is a part of northern Sudan and southern Egypt.
Nubia is said to be the Land of Gold. Because of this, the Egyptians attempted to conquer the land of Nubia.
The land of Nubia had fallen in to the hands of the Egyptians.
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One reason: Plowing large areas of land
A few more reasons: poor farming practices, farmers would loosen up the soil, and the land was deforested, making it loose the roots that held the soil in place.
Specific people who valued religion quite significantly played a role in this. I have studied this material so long ago that I cannot name those particular figures. Do some research and I'm sure you'll be able to find out for yourself.
A concept of federalism where local, state, and national governments interact cooperatively and collectively to solve common problems separately, but more or less equally (dual federalism).
Hope this helps! :)