The polytheist king, Bukhtanasar (Nebuchadnezzar II) had died peacefully in his sleep. Hence, the Israilites he had enslaved under his rule were now free. During his rule, their places of worship were destroyed and their holy book, the Tawrah, was burnt and discarded. After the return of Uzayr from his long sleep, the people of Israil, who had not memorized their Tawrah in ages, were encouraged to memorize it again. And then, the people became believers and their faith in Allah was strengthened again. So, Allah rebuilt their glory, and allowed their city to be entirely rebuilt. Their places of worship were restored, and Uzayr helped to write down a new copy of the Tawrah which would not be lost for generations.
Many years later, the Roman Empire emerged, and they forcibly expelled the Israilites from their territory. After the introduction of Christianity, the Israilites lost all of their authority. They were forced to move to the continent of Khurasan, and their capital was in Balkh. There, they were ruled by a great king named Kay Lohrasp. After the religion of Prophet Isa, peace be upon Him, had been corrupted by Bulus (Paul), the religion of Al-Majoosiyyah appeared. Kay Lohrasp and the Israilites who remained in Balkh adhered to this religion. This king was a very good ruler, a very diplomatic one, and everyone respected him because he was kind hearted and generous. Kay Lohrasp ruled for more than a hundred years, and he was gifted in the construction of cities, canals and educational institutions. But he eventually grew too weak to rule, so he retired, and his son Vishtaspa, also known as Goshtasp, took the throne.
During his reign, the religion of Al-Zaradushtiyya appeared. A man named Zaradusht, one of the close companions of Prophet Aramaya, had cheated his employer and extorted money from him. The disgruntled employer complained to the Prophet. Prophet Aramaya confronted Zaradusht, who kept denying that he did anything. Zaradusht was stubborn, after a while, Prophet Aramaya cursed him. As a result of this curse, Zaradusht suffered from leprosy (the thing that Baldwin IV of Jerusalem suffered from).
Zaradusht was very bitter after this, and he became insane gradually. He started writing texts for a new religion where he would be glorified and venerated. Once he had done these, he travelled to the palace of Vishtaspa, where he introduced the new doctrine to him. Vishtaspa, being ignorant of many of his religion's scriptures, accepted the doctrine of Zaradusht. Then he ordered the people in his kingdom to convert to Zoroastrianism, but they refused, because they were believers in Allah. So, Vishtaspa ordered the mass executions of those who did not convert, and some people accepted the religion out of fear.
After Vishtaspa, his son Esfandiyar became the new ruler. Esfandiyar was instrumental in helping spread the religion of Zoroastrianism to Persia, where he killed all those who believed in Allah. He was one of Zaradusht's closest companions, and even recieved a set of armour blessed by him. He then fought against Rustam and died, and after that his son Kay Bahman ruled, and Kay Bahman killed Rustam. He ruled for more than 80 years, and it is said that the Babylonian kings acted as deputies for him.
The religion of Zoroastrianism was adopted by the Sassanians many years later. Persia was the hotspot of Zoroastrianism. At some point, Buddhism and Hinduism dominated Khurasan instead. Persia remained Zoroastrian until the Sahabah, may Allah be pleased with them, entered Persia and fought the Zoroastrians, conquering the country essentially. Persia became a land of Islam, and Zoroastrianism was erased. Many, many years later, the Seljuks and Ghaznavids would convert the surviving Zoroastrian fire temples into mosques, one example is the Friday Mosque of Herat in Afghanistan.
Sources
Al-Tabari - Tarikh al-Rusul wa al-Muluk
Ibn al-Athir - Al-Kamil fi Al-Tarikh
Ibn Kathir - Stories of the Prophets and Al-Bidayah wan Nihayah volume 2