Why has Islam become a world religion?

Of course, Islam did not immediately become a world religion. It originated in Western Arabia and during the reign of the Prophet Muhammad spread to almost the entire peninsula. The Arab Caliphate contributed to the advancement of Islam, which within a couple of centuries expanded its territories to India and Spain, conquering North Africa, Iraq, Iran and the Caucasus. The rapid conversion of people to Islam was facilitated by the fact that Muslims in this country were given special privileges, in addition, it did not differ much from other popular beliefs.