During World Wars I and II the occupation of Iran by Russian, British, and Ottoman troops was a blow from which the government never effectively recovered. The Constitutional Revolution marked the end of the medieval period in Iran but the constitution remained a dead letter. The growing corruption of the Qajar monarchy led to a constitutional revolution in 1905-1906. Since the Qajar dynasty on due to the inefficiency of the rulers Iran begins to decline and gets smaller and smaller. In 641 Arabs conquered Iran and launched a new era for Persians who were the followers of Zoroaster gradually turned to Islam and it was in the Safavid period when Shiite Islam became the official religion of Iran. Dynasties such as Parthian, Sassanid, Samanid, Ghaznavid, Safavid, Zand, Afsharid, Qajar and Pahlavi. The Achaeamenid Empire was overthrown by Alexander the Great in 330 BC and was followed by The Seleucid Greek Dynasty.ДЄfter the Seleucids, there are about a dozen successive dynasties reigning over the country. In this period Iran stretched from the Aegean coast of Asia Minor to Afghanistan, as well as south to Egypt. But the written history of Iran dates back to 3200 BC and begins with the early Achaemenids, the dynasty under which the first Iranian world empire blossomed.Д¬yrus the Great was the founder of the empire and he is the first to establish the charter of human rights. Recent discoveries indicate that centuries before the rise of earliest civilizations in Mesopotamia, Iran was inhabited by early human ancestors.

Aryans were a branch of the people today known as the Indo-Europeans and are believed to be the ancestors of the people of present India, Iran and most of Western Europe. When the Aryans arrived, they gradually started mingling with the older native Asians. The First inhabitants of Iran were a race of people living in western Asia. But in 1959 due to controversial debates over the name, it was announced that both could be used. Present Iran was historically referred to as Persia until 1935 when Reza Shah Pahlavi formally asked the international community to call the country by its native name, Iran.

History of automation to present day