What was the Atlantic Charter? I know that it was made by FDR & Churchill in 1941, and it was somehow related to African colonies

The Atlantic Charter can be seen as a statement of intention and vision: the intentions of the leaders of the UK and the US about the world after the World War.

Specifically, they believed in the self-determination of the countries, which means that the countries would have the right to govern themselves.

They indented this Charter to apply to Europe only, for example Poland, but later the African countries used it as an argument for de-colonisation.