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For centuries, the contest for global dominance has been inextricably linked to geography and the civilizations that have thrived within it. From the seas to the Heartland, geopolitical competition has revolved around the control of critical spaces and the strategic advantages they confer. Theories of geopolitics provide frameworks for understanding these dynamics. In 1890, Alfred Thayer Mahan argued that naval supremacy was the foundation of global influence, emphasizing the strategic importance of sea power (Mahan, 1890). Later, in 1904, Halford Mackinder introduced his Heartland Theory, positing that control over the Eurasian interior—the ‘pivot area’—was the key to global dominance (Mackinder, 1904). This principle remains relevant in many ways, as the United States continues to rely on sea power for its power projection aimed at global dominance. These theories shaped centuries of strategic thinking, guiding the grand strategies of empires and superpowers alike. Mahan’s principles informed British and American naval dominance. Meanwhile, Mackinder’s ideas influenced British efforts to contain Russian expansion, Nazi Germany’s pursuit of Lebensraum, Soviet strategies of land-based power projection, and U.S. Cold War containment policies aimed at countering Soviet control over the Heartland.

In the 21st century, neither the Heartland nor the seas alone can explain the complexities of current global competition as the world transitions into an era of intensified great power competition and multipolarity. Instead, Nicholas Spykman’s Rimland Theory—which highlights the coastal periphery encircling Eurasia—is the dominant framework for understanding modern geopolitics (Spykman 1944). The Rimland is where land power meets the sea power. It acts as the bridge between land and sea, housing critical natural resources, rapidly growing economies, and a significant portion of the world’s population. The region also hosts vital sea lanes and chokepoints, such as the Strait of Malacca, the Suez Canal, and the Bab-el-Mandeb, essential for global trade and energy flows. As the U.S.-led Western sea power confronts the land power coalition of China, Russia, Iran, and North Korea, the Rimland is increasingly becoming the ultimate battleground where the future of the world order will be determined. In the 21st century, the Rimland is not just a geographic space but the geopolitical fulcrum that will shape the balance of power for decades to come.

Heartland: The Core of Ancient Power

Control over the Eurasian Heartland enabled empires to dominate global power center of gravity in ancient and pre-modern times because of its unparalleled geographic and strategic advantages. Spanning Central Asia, Eastern Europe, and parts of Siberia—the Heartland provided immense natural resources, fertile lands, and access to critical trade routes like the Silk Road (Frankopan 2015). These routes connected the Heartland to wealthy civilizations in the Middle East, South Asia, and China, facilitating economic growth and cultural exchange. The ability to control this region not only ensured access to key resources but also allowed empires to regulate trade flows, taxing merchants and enriching their treasuries. This geographic centrality gave Heartland powers a significant economic and logistical edge. The Heartland's vast and defensible terrain also provided unparalleled security and strategic depth for empires. Its natural barriers—mountains, deserts, and expansive steppes—made it difficult for external adversaries to penetrate.

This security allowed Heartland-based powers, such as the Mongol Empire and later the Russian Empire, to consolidate their rule and focus on outward expansion. From this secure base, empires could project power across Eurasia, conquering peripheral regions and establishing dominance over their neighbors. The Mongols, for example, used their control of the Heartland to build the largest contiguous empire in history, enabling the free flow of goods, technology, and ideas between East and West (. The Russian Empire similarly leveraged the Heartland to expand westward into Europe and eastward into Asia, utilizing its geographic depth to repel invasions from Napoleon and Hitler. For the Ottoman Empire, straddling the intersection of Europe, Asia, and the Middle East, capitalized on its control over the eastern portion of the Heartland to dominate trade and secure strategic chokepoints like the Bosporus and Dardanelles. This enabled the Ottomans to influence both regional and global politics for centuries.

Mackinder famously encapsulated Heartland’s strategic value: “Who rules East Europe commands the Heartland; who rules the Heartland commands the World Island; who rules the World Island commands the World” (Mackinder 1919). Even after the Industrial Revolution enabled Britain to achieve unparalleled naval supremacy, the geopolitical focus remained on controlling the........

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