How did egypt and nubia strengthen each other at various times in their histories?

The correct answer of the given question above would be THROUGH CULTURE INFLUENCES AND TRADING. Egypt and Nubia strengthen each other at various times in their histories through culture influences and trading. Trading both helped Egypt and Nubia in maintaining their dominance in the Nile Region. 

The most important benefit of having a difficult amendment process is that people can never amend any part of the constitution very easily. the makers of the constitution wanted the amendment process to be deliberately hard, so that no person can amend easily for his or her personal benefit. i hope the answer you.