The Greek Colonies
Land-hungry and quarrelsome, Greek cities sent out shiploads of citizens to found new cities from the Black Sea to Spain — Syracuse, Naples, Marseille, and hundreds more. Each colony was politically independent from the day it was founded, tied to its mother city by sentiment and trade rather than rule. The effect was to scatter the Greek language, alphabet, coinage, and habit of political argument around an entire sea. Rome learned its alphabet from Greek colonists in Italy, and Marseille is still there.
Large movements of peoples — pushed or pulled — reshape the societies they leave and the ones they enter.