When Donald Trump first floated the idea of acquiring Greenland during his presidency, the world treated it as a joke—another eccentric flourish in a term already rich in them.
Denmark reacted with disbelief, Greenland’s leaders with irritation, and Washington quietly moved on. Yet the laughter obscured a deeper truth: the United States already enjoys sweeping defence rights in Greenland, secured not by bluster or cheque-book diplomacy, but by a sober Cold War treaty signed in 1951.
That agreement, and what it already grants Washington, raises an awkward question. If America effectively has what it needs for defence, why does Trump keep returning to the idea of ownership?
The 1951 Greenland Defence Agreement between the United States and the Kingdom of Denmark is a product of a very different era. Drafted at the height of early Cold War anxieties, it was designed to secure the North Atlantic and Arctic approaches against Soviet expansion. Denmark, still recovering from occupation during the Second World War and newly aligned with NATO, accepted that it could not defend Greenland alone. The United States, emerging as the West’s indispensable security guarantor, was eager to ensure access to the island’s strategic geography.
The result was an agreement that, while respecting Danish sovereignty, hands Washington extraordinary operational freedom. Article II is the heart of the matter, and subsection (b) is particularly revealing. It states that, “Without prejudice to the sovereignty of the Kingdom of Denmark over such defence area and the natural right of the competent Danish authorities to free movement everywhere in Greenland, the Government of the United States of America, without compensation to the Government of the Kingdom of Denmark, shall be entitled within such defence area and the air spaces and waters adjacent thereto” to exercise wide-ranging rights necessary for defence.
In plain English, the United States can build, operate, and use military facilities in designated defence areas; control airspace and adjacent waters; and move personnel and matériel as required—all without paying rent. These rights are not temporary expedients. They apply for as long as both Denmark and the United States remain members of NATO. There is no expiry date, no scheduled renegotiation, and no mechanism for Denmark unilaterally to revoke them while the alliance endures.
This matters because Greenland’s contemporary strategic value is usually framed in terms of defence. The Arctic is opening up. Russian submarines patrol beneath thinning ice, China eyes polar routes, and NATO planners increasingly speak of the High North as a potential theatre of confrontation. Thule Air Base—now Pituffik Space Base—already hosts vital early-warning radar systems and space-tracking capabilities. From a purely military standpoint, Washington lacks little. The 1951 agreement gives it access without ownership, reach without annexation, and influence without the burdens of colonial administration.
It is therefore implausible to argue that Trump’s renewed interest in “getting” Greenland is about plugging some defence gap. Any American president, briefed by the Pentagon, would know that the United States already enjoys a legal position of remarkable strength. Trump, despite caricatures to the contrary, is not ignorant of leverage. He understands contracts, rights, and deals. If he talks about acquiring Greenland, he does so in full knowledge that defence access is already secured.
That shifts attention to another explanation—one that is less comfortable, but increasingly difficult to ignore. Greenland is not merely a slab of ice and rock. Beneath its retreating glaciers lies a trove of mineral wealth: rare earth elements essential for modern technology, uranium, iron ore, zinc, and potentially vast offshore hydrocarbon reserves. As climate change makes extraction more feasible, Greenland’s economic significance is set to rise dramatically.
Ownership, unlike treaty-based access, confers rights over these resources. It allows control of licensing regimes, influence over extraction contracts, and leverage over supply chains that are becoming ever more geopolitically sensitive. Rare earths, in particular, sit at the heart of the technological competition between the West and China. Beijing currently dominates global supply. For an American administration obsessed with “winning” economic battles, securing an alternative source would be strategically attractive.
Yet Trump’s worldview is not merely strategic; it is transactional and personal. He has consistently blurred the line between national interest and private enrichment, whether through hotels hosting foreign dignitaries, golf courses benefiting from political exposure, or family members cultivating opaque business relationships abroad. In that light, it is not unreasonable to speculate that Greenland’s mineral riches hold a more direct appeal. Control of territory opens doors to concessionary arrangements, friendly operators, and long-term value appreciation—especially in a political culture where oversight is weakened and conflicts of interest are dismissed as partisan nit-picking.
To be clear, there is no public evidence that Trump has personally sought to profit from Greenlandic resources. But politics is not conducted in a vacuum. The pattern of behaviour—treating state power as an extension of personal brand and family fortune—is well established. When combined with the fact that defence access is already guaranteed, the conclusion becomes harder to avoid: Greenland’s attraction lies less in missiles and radar than in minerals and money.
There is also a geopolitical irony at play. The 1951 agreement was crafted to balance Danish sovereignty with American necessity. It worked because both parties trusted NATO as a framework that constrained excess. Trump’s instinct, by contrast, is to chafe at multilateral constraints while exploiting their benefits. He has repeatedly questioned NATO’s value, threatened withdrawal, and treated alliance commitments as optional extras rather than binding obligations. Yet it is NATO membership that underpins America’s Greenland rights. Were the United States to leave the alliance, the legal foundation of its presence would be shaken.
This tension exposes the hollowness of Trump’s Greenland rhetoric. On the one hand, he benefits from an agreement rooted in collective defence. On the other, he undermines the very institution that sustains it. Ownership would sidestep that contradiction. It would sever Greenland from NATO’s legal framework and place it directly under American control, immune to allied oversight and Danish objections.
For Denmark, the implications are profound. Copenhagen has long accepted American military presence as the price of security and alliance solidarity. But that acceptance is predicated on sovereignty being respected in form as well as substance. The 1951 agreement explicitly safeguards Danish sovereignty, even as it grants operational freedom. Any move towards acquisition would blow that balance apart, reviving uncomfortable memories of great powers treating small states as bargaining chips.
Greenland itself is not a passive bystander. Home rule, and a strong independence movement, complicate the picture further. Many Greenlanders resent being discussed as an object rather than a people. While economic development is desperately needed, there is deep scepticism about extractive industries controlled from afar. An American takeover—however packaged—would be unlikely to command local consent.
The larger lesson is that treaties matter. The Greenland Defence Agreement is a reminder that power can be exercised quietly, through law rather than spectacle. It also exposes the emptiness of Trump’s theatrics. He already has what a strategist would want. What he lacks is ownership, and ownership speaks to different instincts altogether.
As Arctic ice melts and great power competition creeps northwards, Greenland will remain a focal point. The United States will continue to rely on the rights secured in 1951, just as Denmark will continue to insist on sovereignty. The danger lies not in the treaty, but in the temptation to discard it in pursuit of something more crude: territorial acquisition justified by spurious arguments and driven by motives that have little to do with collective defence.
In that sense, Greenland is less a strategic puzzle than a moral one. It asks whether Western power is still exercised through alliances and law, or whether it is sliding back towards the raw calculus of enrichment and possession. Trump’s fascination with the island suggests he has already chosen his answer. The rest of the West would do well to remember what the treaty already provides—and what it was designed to prevent.
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