Passage: For this purpose we must ignore modern political boundaries and look at historical developments in the Greater Iran, a vast area covering the Caucasus, Mesopotamia, Anatolia, and Central Asia, beyond the frontiers of present-day Iran. The geography of this region, with its high mountain ranges, plays a significant role in many of the mythological stories. The second millennium BC is usually regarded as the age of migration because of the emergence in western Iran of a new form of Iranian pottery, similar to earlier wares of north-eastern Iran, suggesting the arrival of the Ancient Iranian peoples. This pottery, light grey to black in colour, appeared around 1400 BC. It is called Early Grey Ware or Iron I, the latter name indicating the beginning of the Iron Age in this area.

Question: What should we be looking at instead of modern political boundaries when it comes to Iran?
historical developments in the Greater Iran