These migrations, as has been indicated, were due to natural causes. They were propelled by climatic changes which caused a shortage of the food supply, and by the rapid increase of population under peaceful conditions. Once a migration began to flow, it set in motion many currents and cross currents, but all these converged towards the districts which offered the most attractions to mankind. Prosperous and well-governed States were ever in peril of invasion by barbarous peoples. The fruits of civilization tempted them; the reward of conquest was quickly obtained in Babylon and Egypt with their flourishing farms and prosperous cities. Waste land was reclaimed then as now by colonists from centres of civilization; the migrating pastoral folks lacked the initiative and experience necessary to establish new communities in undeveloped districts. Highly civilized men sowed the harvest and the barbarians reaped it.
It must not be concluded, however, that the migrations were historical disasters, or that they retarded the general advancement of the human race. In time the barbarians became civilized and fused with the peoples whom they conquered. They introduced, too, into communities which had grown stagnant and weakly, a fresh and invigorating atmosphere that acted as a stimulant in every sphere of human activity. The Kassite, for instance, was a unifying and therefore a strengthening influence in Babylonia. He shook off the manacles of the past which bound the Sumerian and the Akkadian alike to traditional lines of policy based on unforgotten ancient rivalries. His concern was chiefly with the future. The nomads with their experience of desert wandering promoted trade, and the revival of trade inaugurated new eras of prosperity in ancient centres of culture, and brought them into closer touch than ever before with one another. The rise of Greece was due to the blending of the Achaeans and other pastoral fighting folks with the indigenous Pelasgians. Into the early States which fostered the elements of ancient Mykenaean civilization, poured the cultural influences of the East through Asia Minor and Phoenicia and from the Egyptian coast. The conquerors from the steppes meanwhile contributed their genius for organization, their simple and frugal habits of life, and their sterling virtues; they left a deep impress on the moral, physical, and intellectual life of Greece.
[[413]] Article "Celts" in Encyclopaedia Britannica, eleventh ed.
[[414]] The Wanderings of Peoples, p. 41.
[[415]] Crete, the Forerunner of Greece, p. 146.
[[416]] Pr. Moosh´kee.
[[417]] "Have I not brought up Israel out of the land of Egypt and the Philistines from Caphtor (Crete)?" Amos, viii, 7.
[[418]] A History of Civilization in Palestine, p. 58.
[[419]] Pinches' translation.