Let Us Return USA! has a list of books and recent news to learn more about the Chagossians and their history: https://www.letusreturnusa.org/books
See this excellent list of books and articles compiled by Dr. Richard Dunne.
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This online human rights archive is documenting the history of the Chagossian people and their expulsion during construction of the US/UK military base on the Indian Ocean island Diego Garcia.