Congress determines how the seats in the house are to be apportioned every 10 years, after the census is taken. based on voter turnout after each presidential election. every 3 years, after the census is taken. based on how many republicans and democrats are already in office.

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.