The immigration act of 1924, the oriental exclusion act, and the creation of the border patrol are three measures implemented by the united states in 1924, which resulted in

This resulted in “a drastic drop in immigration which lasted 40 years” by setting racially biased quotas. The quota supplied immigration visas to 2 percent of the number of people of each nationality in the United States. These acts entirely expelled immigrants from Asia.

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.