Armenian uplands into the open steppe of Asia Minor, and there made their home, just as the Magyar Turks only a century or two earlier rode round the north of the Black Sea into the Hungarian Steppe. Under great leaders of cavalry of the Ottoman dynasty, these Turks crossed the Dardanelles, and, following the 'Corridor' of the Maritza and Morava valleys through the Balkan Mountains, achieved the conquest of Magyar Hungary itself. From the moment that the city of Constantinople fell into Turkish hands in 1453, the Black Sea was closed to the Venetian and Genoese seamen. Under Rome, the realm of the seamen had been advanced to the northern shore of the Black Sea; under the Ottoman Turks the Heartland, the realm of the horsemen, was advanced to the Dinaric Alps and the Taurus. This essential fact has been masked by the extension of Turkish dominion into Arabia outside the Heartland; but it is evident again to-day when Britain has reconquered Arabia for the Arabs. Within the Heartland, the Black Sea has of late been the path of strategical design eastward for our German enemy.
We defined the Heartland originally in accordance with river drainage; but does not history, as thus recounted, show that for the
