Final answer:
The political cartoon conveys the message of European imperialism and domination over Africa.
Step-by-step explanation:
The message conveyed by the political cartoon of Cecil Rhodes, titled 'The Rhodes Colossus,' is the idea of European imperialism and domination over Africa. The cartoon depicts Rhodes standing over Africa, symbolizing British control and exploitation of the continent. It represents the belief in the superiority of the European race and their mission to 'civilize' and exploit the African people and resources.