The question—and its limits
What if Chagossians had been allowed to remain in their homeland while military use of Diego Garcia was pursued? This is a counterfactual question, not an account of a documented alternative agreement. Its value lies in examining the choices a different policy would have required—not in predicting a happier outcome.
Begin with the historical record, then distinguish assumptions from evidence.
What the record establishes
- 1965: On 8 November, the United Kingdom detached the Chagos Archipelago from Mauritius and established the British Indian Ocean Territory.
- 1966: The UK and United States concluded an agreement concerning military use of the territory.
- 1968: Mauritius gained independence from the UK.
Diego Garcia became the site of a joint UK–US military base. These points are documented in the UK Parliament’s historical background.
Between 1967 and 1973, inhabitants who had left Chagos were prevented from returning; others were forcibly removed and prevented from returning. The International Court of Justice’s summary of its 2019 advisory opinion records this distinction.
On 25 February 2019, the Court concluded that Mauritius’s decolonisation had not been lawfully completed when it became independent in 1968 following Chagos’s separation. That was a legal conclusion about the historical process, not a finding that a particular alternative residence arrangement would have succeeded. See the Court’s summary.
Define what ‘allowed to remain’ means
Before building an alternative timeline, choose the change you are imagining. Three different premises are possible:
- Residence on Diego Garcia alongside military use. This branch assumes that a civilian community remains on the island used for the facility.
- Residence elsewhere in the archipelago. This branch assumes continued residence on other islands, but does not preserve every resident’s access to their own home.
- A different military arrangement. This branch changes the proposed scale, location or conditions of military use to accommodate continued residence.
These are analytical possibilities, not documented proposals established by the sources used here. None should be treated as automatically feasible or as something Chagossians would necessarily have accepted.
A hypothetical branch: residence alongside military use
Everything in this section is counterfactual analysis. Assume that decision-makers pursue military use while permitting a resident Chagossian community to remain. Do not assume that permission alone resolves the practical or political questions.
First decision: whose agreement counts?
For this scenario, ask how residents would participate in decisions about their future. Would they have representatives, enforceable protections or a way to challenge restrictions? An agreement between governments should not simply be written as proof of community consent.
A useful fictional branch could begin with negotiations over these questions. Any invented meeting, participant or dialogue must be labelled as fiction.
Second decision: what would residence involve?
Test the imagined arrangement against concrete questions:
- Could residents move between settlements and islands?
- What access would they retain to homes and land?
- How would livelihoods, supplies, healthcare and education be supported?
- Where would military access restrictions apply?
- Who would resolve disputes between residents and military authorities?
These questions identify assumptions to investigate. They do not establish that coexistence was either workable or impossible.
Third decision: could the arrangement endure?
One possible outcome is a continuing community whose interests shape later decisions. Another is an increasingly restrictive arrangement that becomes difficult to sustain. A third is renewed negotiation over military use.
Do not turn any branch into a prediction. Keeping residents in the islands would not, by itself, settle questions of sovereignty, consent or political authority. For the purposes of this exercise, treat each as a separate problem requiring its own assumptions and evidence.
Classroom activities
1. Map the evidence
Put the documented dates above on a timeline. Add a separate column for proposed policy changes. Label each entry documented fact, interpretation or counterfactual assumption.
2. Compare two branches
Write one branch in which residents remain on Diego Garcia and another in which residence continues elsewhere in Chagos. For each, explain what changes—and what access or choices might still be lost.
3. Audit a confident claim
Test the statement: ‘A community and a military base could easily have coexisted.’ What evidence would be needed to support the word ‘easily’? Then apply the same scrutiny to the opposite claim: ‘Coexistence was impossible.’ Treat the result as a research plan, not a verdict.
FAQ
When was Chagos separated from Mauritius?
In 1965. The Parliamentary background dates the detachment to 8 November.
When were Chagossians displaced?
The Court’s historical summary gives 1967–1973, distinguishing forced removal from preventing people who had left from returning.
Does this article show that remaining alongside the base was feasible?
No. It sets out hypothetical arrangements and questions for testing them. It does not establish an agreed plan, practical feasibility or residents’ consent.
Build an evidence-led what-if
Choose one policy change, state your assumptions and explain what evidence would strengthen or weaken your scenario. If you invent scenes or dialogue, label them clearly as fiction. You can start at Create.
Sources
- International Court of Justice, press release summarising the advisory opinion, 25 February 2019. This is the Court’s explanatory summary, not the full opinion.
- House of Lords International Agreements Committee, historical background to the UK–Mauritius agreement. Used here for historical chronology, not as a statement of present treaty implementation.
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