The most general and common methodological formula shared by all geopoliticians is the assertion of fundamental historical dualism between Susha, Tellurocracy, the “Nomos” of the Earth, Eurasia, heartland, the “Middle Earth”, ideocratic civilization, the “geographical axis of history” on the one hand, and the Sea, thalassocracy , Sea Power, the “nomos” of the Sea, the Atlantic, the Anglo-Saxon world, a commercial civilization, an “external or island crescent,” on the other. This can be considered as the main law of geopolitics. Outside of the postulation of this dualism, all other conclusions lose their meaning. Despite all the differences in particular aspects, not one of the founders of geopolitical science questioned the fact of such a confrontation. In its significance, it is comparable with the law of universal gravitation in physics.