The experience of Germany was typical of the change of front. From the tenth to the middle of the sixteenth century, this heir of the old Roman Empire was drawn toward Italy by every tie of culture, commerce, and political ideal. This concentration of interest in its southern neighbor made it ignore a fact so important as the maritime development of the Hanse Towns, wherein lay the real promise of its future, the hope of its commercial and colonial expansion. The shifting of its historical center of gravity to the Atlantic seaboard therefore came late, further retarded by lack of national unity and national purposes. But the present wide circle of Germany's transoceanic commerce incident upon its recent industrial development, the phenomenal increase of its merchant marine, the growth of Hamburg and Bremen, the construction of ship canals to that short North Sea coast, and the enormous utilization of Dutch ports for German commerce, all point to the attraction of distant economic interests, even when meagerly supported by colonial possessions. Location, therefore, while it is the most important single geographic factor, is at the same time the one most subject to the vicissitudes attending the anthropo-geographical evolution of the earth. Its value changes with the transfer of the seats of the higher civilizations from sub-tropical to temperate lands; from the margin of enclosed sea to the hem of the open ocean; from small, naturally defined territories to large, elastic areas; from mere periphery to a combination of periphery and interior, commanding at once the freedom of the sea and the resources of a wide hinterland. [Sidenote: Contrasted historical sides.]