Nice Quiz though:D
- Cabinda was Portuguese, not British
- Ruanda-Urundi didn't exist in 1913, it was part of German East Africa and first occupied by Belgium only in 1916
- though it doesn't affect the list, Kamerun was bigger in 1913, see Neukamerun
I also believe that Anglo-Egyptian Sudan should be accepted (filling in both Egypt and Sudan) given that the condominium began in 1899, before the date of this quiz.
Fun quiz overall, though.
The borders for Libya are also wrong, but I understand that the would be harder to fix. Ruanda-Urundi should not be part of this quiz, and it's relatively easy to merge it with German East Africa in an SVG editor.