Nicholas Spykman was a Dutch-American professor of international relations at Yale who systematically corrected and extended Mackinder's Heartland theory. Where Mackinder argued that control of the Eurasian interior was the key to world domination, Spykman argued that Mackinder had it backwards: it was the coastal periphery — the Rimland — that was decisive. The Heartland cannot project power without access to the sea. The Rimland is where the decisive contests of the twentieth century were fought, and its control — through alliances, bases, and forward presence — became the structural foundation of US grand strategy from 1945 onward.
Spykman wrote his major works during World War II, at a moment when the United States was confronting for the first time the question of what its post-war strategic posture should be. He died in 1943, before the war ended — but his two books, America's Strategy in World Politics (1942) and the posthumous The Geography of the Peace (1944), framed the debate about American grand strategy with extraordinary precision.
The question Spykman was answering was: given that the United States had been pulled into two world wars by instability in the Eurasian coastal zones, what geographic framework should guide American strategy to prevent a third? His answer was that the United States had a permanent strategic interest in preventing any single hostile power from dominating the Eurasian Rimland — the coastal arc from Western Europe through the Middle East to East Asia. This is what the US alliance system, military basing network, and forward presence strategy have been organized to accomplish ever since.
Spykman accepted Mackinder's basic framework — geography as the permanent constraint on power, the closed political system, the contest between land and sea power. But he reversed the key conclusion. Mackinder said control the Heartland. Spykman said the Heartland, by itself, is strategically limited: it has no warm-water ports, limited access to oceanic trade routes, and cannot project naval or maritime power without controlling the coastal zones that surround it. The decisive zone is therefore the Rimland — the crescent of coastal territory that runs from Western Europe through the Middle East, South Asia, and Southeast Asia to the Pacific coast of East Asia.
The Rimland is strategically decisive for several reasons: it contains most of Eurasia's population and industrial capacity; it provides maritime access that multiplies the power of any state that controls it; and it is where the competition between Heartland land power and oceanic sea power is actually decided. Spykman also argued, with remarkable prescience, that a post-war China and a post-war Russia might both become threats to US interests — and that the US should structure its post-war settlement to prevent either from consolidating control of the Rimland.
The US alliance architecture that emerged from World War II — NATO in Western Europe, bilateral security treaties in the Pacific, US bases across the Middle East and East Asia — maps almost exactly onto the Rimland. Whether or not US planners explicitly read Spykman, the logic he articulated is what they implemented.
Spykman is EIR's primary geographic framework for understanding US alliance commitments. NATO, the US-Japan treaty, US-South Korea, the network of bases across the Gulf — all of these are Rimland commitments. They are not arbitrary: they reflect the geographic logic that a unified hostile power controlling the Eurasian coastal arc would be able to exclude US power from the World-Island and undermine the global trade and financial systems on which US prosperity depends.
China's military and diplomatic strategy in the Indo-Pacific reads, from a Spykman perspective, as a systematic attempt to push the US out of the Western Pacific Rimland. The "island chains" concept in Chinese strategic thinking — first island chain (Japan, Taiwan, Philippines), second island chain (Guam, Marianas) — is essentially a Rimland contest: China seeks to establish sea-denial capability within the first island chain, forcing the US back to the second. Taiwan is the geographic linchpin of the first island chain. This is why its status is existential, not merely symbolic, from a geopolitical standpoint.