What does the poem Africa my Africa mean?

it talks about a guy (the author) who has never been in Africa but who remains proud of the achievements of his continent; the author also sorts of talks about his pride in how the Africans got out of slavery and about how Africa keeps remains the bravest continent and stuff like that...
In addition, the author died in a plane crash when he was coming into an African country for the first time, so his dream of visiting Africa never came true...