How did the culture of each city-state become the national culture?

I don't know for sure but i think it had something to do with the government and congress laws being passed around

credit card number 4 is the right answer

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.