The Monroe Doctrine and the British Flag

In 1823, the United States declared the Western Hemisphere its strategic domain. The Monroe Doctrine, articulated by President James Monroe but shaped by Secretary of State John Quincy Adams, warned European powers against further colonisation or interference in the Americas. It has been invoked at various points in the two centuries since — most notably during the Cuban Missile Crisis — to assert US primacy in its own neighbourhood.

For most of that period, the Monroe Doctrine coexisted with the British Overseas Territories in the Caribbean because the US-UK relationship was close enough that the doctrine was never applied against British interests. The assumption of allied restraint was so deeply embedded that it was rarely examined. British territories in the Caribbean were simply outside the scope of hemispheric assertiveness, as a matter of practical alliance management if not of formal doctrine.

That assumption is now less stable than at any point in the post-war period.

What Has Changed

The current US administration has not merely invoked the Monroe Doctrine; it has stated explicit desires to control the Western Hemisphere in terms that previous administrations, regardless of party, did not use in public. The Greenland rhetoric — the explicit statement of desire to acquire the territory of a NATO ally — establishes something qualitatively new: that allied territorial integrity is not, in the current administration's framing, a constraint on US hemispheric ambition. The Panama Canal statements establish that existing international agreements governing strategic waterways are subject to revision if the administration judges US interests to require it.

These are not isolated statements. They are data points in a consistent pattern: an administration that is willing to assert hemispheric interests against allied positions, that treats the Western Hemisphere as a zone of US primacy rather than shared international governance, and that has demonstrated a willingness to apply economic and political pressure to achieve objectives that previous administrations pursued through diplomacy.

The question this creates for the UK is specific and uncomfortable: at what point do British interests in the Caribbean — interests that have coexisted with US hemispheric claims for two centuries on the basis of allied restraint — become subject to the same assertiveness that is being applied to Greenland, Panama, and Cuba?

"Allied territorial integrity is not, in the current administration's framing, a constraint on US hemispheric ambition."

Cuba as the Pressure Point

Cuba is the most immediate variable in the Caribbean threat picture. Increased US pressure on Cuba — whether through economic tightening, diplomatic isolation, or more direct intervention — creates instability in the wider Caribbean that directly affects the British territories. The Cayman Islands sit 150 miles south of Cuba. The Turks and Caicos lie in the same island chain. Any significant deterioration in Cuban stability generates effects — refugee movements, economic disruption, potential military activity — in waters that are simultaneously Cuban, American, and British in the strategic sense.

The British territories have managed their proximity to Cuba pragmatically for decades. The Cayman Islands' financial services sector has operated under US pressure regarding Cuban client exposure. The relationship has been commercially managed rather than strategically planned. In an environment where US Cuba policy becomes more aggressive and less predictable, that pragmatic management may no longer be sufficient.

The pressure on Cuba is unlikely to diminish. The Iranian dimension compounds it: the US administration's hardened position toward Tehran means that any Cuban alignment with Iran — economic, diplomatic, or security-oriented — functions as a force multiplier on the pressure already being applied to Havana. The Cuba risk for the British territories is not static. It is escalating.

The Domino Sequence

The pressure on Cuba does not occur in isolation. In Venezuela, US intervention — through economic sanctions, diplomatic pressure, and increasingly direct political engagement — has already reshaped a regional state whose stability, or instability, directly affects the wider Caribbean. Haiti, already a failed state in practical terms with its governmental capacity hollowed out and its security environment dominated by criminal networks, presents a scenario where US intervention under the guise of addressing drugs, organised crime, or the restoration of regional stability becomes not merely possible but probable.

The dominoes have begun to align. Venezuela, Cuba, Haiti: each represents a different justification, a different mechanism, a different stage of the same underlying logic. Each intervention normalises the next; each assertion of hemispheric control extends the range of what the doctrine can plausibly reach. The question for the UK is not whether any individual intervention is justified on its own terms. It is whether, as the doctrine extends its reach, British interests in the Caribbean remain as insulated from it as the assumption of allied restraint has always suggested.

"Each assertion of hemispheric control extends the range of what the doctrine can plausibly reach."

The Financial Pressure Lever

The most likely instrument of US pressure on the Caribbean territories is not military. It is financial. US pressure on the regulatory frameworks of the Cayman Islands and British Virgin Islands — regarding tax transparency, beneficial ownership disclosure, and anti-money laundering compliance — has been sustained and escalating for two decades. This pressure has been applied through international standard-setting bodies, bilateral diplomatic channels, and direct legislative action such as the Foreign Account Tax Compliance Act.

FATCA, introduced in 2010 and implemented during the period I was working in Cayman, was the most disruptive single regulatory intervention the jurisdiction had experienced in decades. It required every financial institution to identify, report on, and in some cases withhold from US-linked accounts — effectively deputising foreign regulators and private firms into the US tax enforcement architecture. The administrative burden was immense; the operational impact dominated the sector for years. FATCA was not an isolated event. It sat on top of two decades of escalating pressure through the OECD's harmful tax practices initiative, the BEPS framework, and successive rounds of anti-money-laundering standards.

In a deteriorating US-UK relationship, the financial pressure lever becomes more available, not less. An administration willing to assert hemispheric primacy against allied positions has no structural reason to moderate its regulatory pressure on British territory financial centres. The Cayman Islands' position as one of the world's leading fund domiciles makes it particularly vulnerable to extraterritorial US regulatory action.

The China Dimension

US hemispheric assertiveness does not occur in isolation. It is in significant part a response to Chinese economic and strategic expansion in the Western Hemisphere: Belt and Road adjacent investments in Caribbean and Central American states, port development, telecommunications infrastructure, and diplomatic relationship-building that has shifted several Caribbean nations' formal recognition from Taiwan to Beijing.

Chinese infrastructure investment in states geographically proximate to the British territories creates security and intelligence considerations that extend beyond those states' borders. Telecommunications infrastructure in regional networks creates potential vulnerabilities in communications systems that the territories depend on for connectivity. The British territories are caught between two great power competition dynamics simultaneously: US assertiveness that may threaten their regulatory and economic autonomy, and Chinese expansion that creates security concerns in their immediate environment. Neither dynamic is one they can address on their own.

What the UK's Response Framework Looks Like

The honest answer is: thin. The UK's defence commitments to the Overseas Territories are real but resource-constrained. The Falklands garrison exists because of 1982. The Caribbean territories have no equivalent permanent military presence. Royal Navy patrol vessels cover the region, but coverage is not the same as capability. The ability to project meaningful assistance to a Caribbean territory under sustained geopolitical pressure — as distinct from post-hurricane humanitarian response — has not been tested and is not obviously credible.

The FCDO manages territory relationships diplomatically. The Ministry of Defence manages the defence commitments. The Home Office manages constitutional matters. No single body is responsible for the integrated resilience picture — for understanding the combined effect of climate vulnerability, infrastructure fragility, financial services concentration, and geopolitical pressure on British communities that have a constitutional right to expect the UK to take their security seriously.

This is the structural gap that an Office of National Resilience, with an explicit Overseas Territories mandate, would begin to address. Not by resolving the geopolitical pressures — which are beyond any single body's control — but by ensuring that someone is responsible for understanding them, modelling their implications, and ensuring that the UK's response, when it is needed, is a plan rather than an improvisation.

"The ability to project meaningful assistance to a Caribbean territory under sustained geopolitical pressure has not been tested — and is not obviously credible."