Final answer:
The Indo-European Migration involves prehistoric people from the Eurasian Steppe, spreading across Europe and Asia, of which the Greeks were a part, moving south after the Trojan War and later founding colonies in the Mediterranean during population pressures in the Archaic period.
Step-by-step explanation:
The Indo-European Migration refers to a series of expansive movements by prehistoric populations from the Eurasian Steppe into wider areas of Europe, Anatolia, Iran, South Asia, and other regions. This encompasses the movement of Greek-speaking tribes after the Trojan War. Focusing on the Greeks, we can observe their migration patterns caused by the need for fertile land as witnessed post-Trojan War when the Dorians moved from northwest Greece to the south. This was part of a broader trend during the Late Bronze Age Collapse when instability led various people, including the 'Sea Peoples,' to seek new settlements across the eastern Mediterranean.
Another branch of the Indo-Europeans migrated around 2000 BCE from Central Asia into northern India, establishing themselves as pastoralists transitioning into farming, while still holding cattle breeding and the cow as important aspects of their society. Additionally, the Greeks expanded their influence and colonies during the Archaic period due to increased population and shortage of farmland, stretching throughout the Mediterranean to areas like Sicily and southern Italy, known as 'Magna Graecia.'