Sir Halford John Mackinder was a British geographer who wrote a paper in 1904 called "The Geographical Pivot of History." Mackinder's paper suggested that the control of Eastern Europe was vital to control of the world. He formulated his hypothesis as:
Mackinder's Heartland (also known as the Pivot Area) is the core area of Eurasia, and the World-Island is all of Eurasia (both Europe and Asia).
Who rules East Europe commands the Heartland
Who rules the Heartland commands the World-Island
Who rules the World-Island commands the world
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