What is one responsibility only for us citizens? to volunteer for a political candidate to serve in the military to serve on a jury to pay taxes

sounds good to me mate!

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.