Okay kiddo, here's what happened. A long time ago, there was a group of people called the Chagossians. They lived on a group of islands called the Chagos Islands, which belong to a bigger group called the British Indian Ocean Territory.
The British government decided they wanted to use the big island on the Chagos Islands, Diego Garcia, for a military base because it was in a really strategic location. So they told all the Chagossians, who had been living there for hundreds of years, that they had to leave.
They didn't give the Chagossians much notice or let them take many of their things with them. They shipped them away to other islands and countries and made sure they couldn't go back to their homes on the Chagos Islands.
The Chagossians were really sad and angry about this because they loved their homes and had no idea where they were going to live or how they were going to support themselves.
Even today, many Chagossians and their families are still fighting for the right to go back to the Chagos Islands and live there again. It was a really unfair and sad situation that has caused a lot of pain and suffering for a lot of people.