For the record, even the Guardians coverage of this is terrible.
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They are handing control of Chagos over to Mauritius, not back to being an independent Chagossian ~~state~~ culture as it operated before. (Though arguing that it was technically part of Mauritius and illegally separated is the legal justification for returning it, so this was unavoidable given the path taken).
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They did not consult widely with Chagossians, just the Mauritian government.
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Part of 'handing over', includes a mandatory 99 year lease for the main island of Diego Garcia to the US for their military base.
It's better than the UK controlling all of the Chagossian islands but it's a far cry from justice.
I guess more accurately, Chagos as a culture is founded by slaves who worked the island and were freed. It was originally part of the Seychelles and then transferred to be considered part of Mauritius, and then sold to the British, and then leased to the Americans, but the Chagossian people have never really considered themselves part of Mauritius. Certainly more part of Mauritius than Britain, but still distinct as a culture, people, and language.