Now, the centre of civilisation is not a fixed point. It has varied from time to time, and may yet vary. In the very earliest historical period, there was hardly such a thing as a centre of civilisation at all. There were civilisations in Egypt, Assyria, Babylonia, Etruria; discrete civilisations of the river valleys, mostly, which scarcely came into contact with one another in their first beginnings; any more than our own came into contact once with the civilisations of China, of Japan, of Peru, of Mexico. As yet there was no world-commerce, no mutual communication of empire with empire. It was in the AEgean and the eastern basin of the Mediterranean that navigation first reached the point where great commercial ports and free intercourse became possible. The Phoenicians, and later the Greeks, were the pioneers of the new era. Tyre, Athens, Miletus, Rhodes, occupied the centre of the nascent world, and bound together Assyria, Babylonia, Egypt, Asia Minor, Greece, Sicily, and Italy in one mercantile system. A little later, Hellas itself enlarged, so as to include Syracuse, Byzantium, Alexandria, Cyrene, Cumae, Neapolis, Massilia. The inland sea became "a Greek lake." But as navigation thus slowly widened to the western Mediterranean basin, the centre of commerce had to shift perforce from Hellas to the mid-point of the new area. Two powerful trading towns occupied such a mid-point in the Mediterranean--Rome and Carthage; and they were driven to fight out the supremacy of the world (the world as it then existed) between them. With the Roman Empire, the circle extended so as to take in the Atlantic coasts, Gaul, Spain, and Britain, which then, however, lay not at the centre but on the circumference of civilisation. During the Middle Ages, when navigation began to embrace the great open sea as well as the Mediterranean, a double centre sprang up: the Italian Republics, Venice, Florence, Genoa, Pisa, were still the chief carriers; but the towns of Flanders, Bruges, Ghent, and Antwerp began to compete with them, and the Atlantic states, France, England, the Low Countries, rose into importance. By and by, as time goes on, the discoveries of Columbus and of Vasco di Gama open out new tracks. Suddenly commerce is revolutionised. France, England, Spain, become nearer to America and India than Italy; so Italy declines; while the Atlantic states usurp the first place as the centres of civilisation. Our own age brings fresh seas into the circle once more. It is no longer the Atlantic, the Mediterranean, or the Indian Ocean that alone count; the Pacific also begins to be considered. China, Japan, the Cape; Chili, Peru, the Argentine; California, British Columbia, Australia, New Zealand; all of them are parts of the system of to-day; civilisation is world-wide.