How did Islam become the primary religion for powerful empires?

Which of the following is one way the goverment of russia is considered more limited than the goverment of the soviet union

How was the appointment of two consuls during the roman republic an example of a democratic principle? one consul represented patricians and one represented plebeians, so that all citizens had representation each consul had control over the same number of military legions, which prevented either one from a forceful takeover. consuls had to agree on all decisions, which prevented any one person from gaining too much power. consuls had to make decisions based on majority rule in the senate. quickly

Restricting immigrants from entering a country may be based on what belief?