More than one date
The separation of the Chagos Archipelago from Mauritius occurred in 1965. The forced removal of the population took place between 1967 and 1973. Treating both as a single event in 1965 conceals the sequence of decisions and their consequences.
The International Court of Justice’s 2019 advisory opinion sets out that history, including the displacement of the islanders and the establishment of the military facility on Diego Garcia.
What the 2019 opinion addressed
The Court examined the legal consequences of the separation. Its opinion concluded that Mauritius’s decolonisation had not been lawfully completed when independence was granted in 1968. The case overview explains the questions put to the Court and its conclusions.
Those are findings from 2019. They should not be mistaken for a complete description of current diplomatic arrangements, legislation or individual rights of return.
Keep the people within the history
A chronology of governments and territorial decisions is only one part of this subject. The experience of displacement also requires attention to Chagossian testimony. Do not invent a conversation, a family’s possessions or a precise departure scene and present it as documented fact.
When researching a testimony, record the speaker, interview date and archive. Distinguish the person’s experience from a claim about every islander.
A question for discussion
What would meaningful participation by the affected community have required before a decision about their homeland? This is an ethical and historical question, not evidence that one alternative negotiation would certainly have produced a particular outcome.
Read the opinion’s historical section first, then list the decisions, decision-makers and people affected. Keeping those categories visible helps prevent the removal from being reduced to an abstract strategic calculation.
Editorial review
Reviewed on 26 September 2026. Corrected the removal chronology and removed unsupported claims about a public-health pretext. This is a historical account, not an update on present-day legal arrangements.