Decolonisation, as a process, has more or less run its course, but not entirely. There is a small number of colonies that exist. Britain’s last colony in Africa is called the Chagos Archipelago. The British call it the British Indian Ocean territory. It was, for a century and a half, a part of Mauritius, in Africa. In 1965, the British government decided it would give independence to Mauritius, but it wished to keep hold of the islands of the Chagos Archipelago, and it separated them. Mauritius obtained independence in 1968. It was decolonised, but it considered the decolonisation not complete, and for 50 years it has sought to recover the Chagos Archipelago from the United Kingdom, which has leased out one of the islands, Diego Garcia, as a United States military base.
I was hired about 10 years ago by the government of Mauritius to help recover the Chagos Archipelago. We designed a legal strategy based on those United Nations rules adopted in 1945 and, eventually, we managed to get a case to the International Court of Justice. The General Assembly of the United Nations made the request for the case, and in February 2019, the International Court of Justice ruled, unanimously, that Chagos belonged to Mauritius. The United Kingdom was an unlawful occupier, and it had unlawfully separated Chagos from Mauritius. Why? Because, said the International Court of Justice, decolonisation is premised on the right to self-determination. The right to self-determination includes the principle of territorial integrity. When you grant a colony independence, the whole of the colony is entitled to independence.