Harold Mackinder, a British geographer and member of Parliament, contributed a geopolitical theory called:

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Harold Mackinder's geopolitical theory is known as the Heartland Theory. This theory suggests that whoever controls the "heartland" (the Eurasian landmass) holds the key to global power. The theory is based on the idea that land power, rather than sea power, is the primary factor in determining global dominance.

Harold Mackinder, a British Geographer and Member of Parliament, Contributed