In Mackinder's theory, whoever controlled the heartland (the interior of North America) would be able to exert world control.

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Mackinder's theory actually referred to the Heartland as the interior of Eurasia, not North America. He believed that whoever controlled the Heartland, which included Russia and other Central Asian countries, would be able to dominate the world due to its strategic location and resources.

In Mackinder's Theory, Whoever Controlled the Heartland (The Interior of North