Firstly, Nubia culture can be describe as the an ancient type of region located along the river Nile valley in the present areas of south Egypt which consist of the lower Nubia(desert mountain) and the upper Nubia( narrow but fertile land) and was rule by Prince Taharka.
The Kemet/Egyptian are the ancient people of Egypt who do call their lands Kemet due to the land being black and fertile. The Kemet are also known as the Egyptians.They are people whose land are fertile because of the proximity of their land in its flow from south to north.
The political structer changed during the gilded age because a lot of the leaders became rich during this era, causing them to be more invested in business politically.