Basically, it states that since 50% of world's resources are concentrated at Europe + Asia + Africa, whoever desires to control the world should control this area first. If you think of it this way, it makes sense that if an international super-power such as the USA wishes to maintain that power, it has to control this region, or at least make sure no one else controls it. The greatest threat in this situation is certainly China and the best possible way to attack this problem would be to create internal strife considering the peculiar circumstances.
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Basically, it states that since 50% of world's resources are concentrated at Europe + Asia + Africa, whoever desires to control the world should control this area first. If you think of it this way, it makes sense that if an international super-power such as the USA wishes to maintain that power, it has to control this region, or at least make sure no one else controls it. The greatest threat in this situation is certainly China and the best possible way to attack this problem would be to create internal strife considering the peculiar circumstances. </tinfoil>