كيف تحولت إيران إلى دولة مسلمة ؟
The Islamic conquest of Persia (637–651) led to the end of the Sasanian Empire and the eventual decline of the Zoroastrian religion in Persia. However, the achievements of the previous Persian civilizations were not lost, but were to a great extent absorbed by the new Islamic polity. Islam has been the official religion of Iran since then, except for a short duration after the Mongol raids and establishment of Ilkhanate. Iran became an Islamic republic after the Islamic Revolution of 1979.
Islamic Revolution of 1979