... Recent discoveries indicate that, centuries before the rise of earliest civilizations in Mesopotamia, Iran was inhabited by human. But the written history of Iran dates back to 3200 BC. It begins with the early Achaemenids, The dynasty whose under the first Iranian world empire blossomed.
... Throughout Iran's long history, in spite of different devastating invasions and occupations by Arabs, Turks, Mongols, British, Russians, and others, the country has always maintained its national identity and has developed as a distinct political and cultural entity. More about History of Iran