Sir Halford Mackinder developed what would become known as the heartland theory which suggested that interior Eurasia contained a critical "pivot area" that would generate a state capable of challenging for world domination.The key to the area according to Mackinder was

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Mackinder's Heartland Theory posits that Eastern Europe is the key to controlling the "pivot area" or Heartland of Eurasia, which in turn could lead to domination of the world. This is because control over Eastern Europe provides the necessary leverage and access to influence the vast resources and strategic position of the Heartland.

Sir Halford Mackinder Developed What Would Become Known as the Heartland