Why the United States Has Always Wanted Greenland – And Why It Still Matters Today

Summary: The US–Greenland story is not a new “Trump idea” or a random Arctic obsession. Washington has eyed Greenland since the 1860s, built wartime footholds in the 1940s, and locked in long-term defence access with Denmark in 1951. As the Arctic opens up, Greenland sits right on the security map for the US, Nato, and therefore Britain too.

Why Greenland keeps coming up

Greenland is huge, remote, and strategically placed across North Atlantic and Arctic routes.

In hard security terms, it matters for early warning, space and missile tracking, and control of air and sea lanes between North America and Europe.

America’s interest goes back to the 19th century

US officials were discussing Greenland as far back as the 1860s, in the same expansionist era as the Alaska purchase.

The logic was simple: geography, resources, and the idea that Arctic territory could become a future strategic frontier.

The Denmark bargain that still shapes today

In the run-up to the US purchase of the Danish West Indies (now the US Virgin Islands), Washington formally recognised Danish sovereignty over Greenland.

That matters because it undercuts modern claims that Greenland is somehow “up for grabs” under international law.

World War II: the moment the US moved in

When Denmark was occupied during the war, the US sought practical control over Greenland’s defence to stop Nazi influence reaching the North Atlantic.

A key wartime agreement allowed the US to establish and use defence facilities on Greenland for the “adequate defense establishment” needed in the moment.

“…the utilization of any area deemed by the Government of the United States of America to be needed for this purpose shall not be delayed…”

1946: Truman’s secret offer to buy Greenland

After the war, Washington quietly offered Denmark $100 million in gold for Greenland.

Copenhagen refused, but the episode showed how central Greenland had become to American military planning as the Cold War began.

1951: the agreement that still defines US access

In 1951, Denmark and the US signed the modern Defence of Greenland agreement, replacing the wartime arrangement.

It cemented the US right to operate defence areas in Greenland within a Nato framework, while recognising Danish sovereignty.

“…recognizes ‘the sovereignty of the Kingdom of Denmark’ over Greenland.”

Thule then, Pituffik now

The best-known US site is the old Thule Air Base, now Pituffik Space Base, used for space and missile-warning missions.

During the Cold War it was a critical node for tracking threats across the polar route.

Greenland’s self-rule changes the politics, not the geography

Greenland gained deeper self-government in the 2000s, including control over many domestic matters and a pathway to independence via referendum.

But defence and foreign policy still involve Denmark, and any major basing expansion remains politically sensitive in Nuuk as well as Copenhagen.

Why this matters to Britain

For the UK, Greenland is not a distant “US problem”. It sits near key Nato lines of communication and the wider North Atlantic security picture.

British defence, intelligence cooperation, and transatlantic trade all get hit when Nato allies start rowing over Arctic territory.

What happens next: realistic options, not fantasy maps

The most likely future is not “buying Greenland”, but more defence coordination, more Arctic patrols, and harder bargaining over minerals and investment.

The political pressure point is simple: Greenlanders want more control and prosperity, Denmark wants sovereignty respected, and the US wants security guarantees that keep pace with Russia and China’s Arctic ambitions.