The boy on the bus gave a thumbs up to the kid swimming because of his t-shirt.
There are no countries in the entire continent of Africa that were not at some point colonized. However, Ethiopia, which is in East Africa, was colonized for the shortest time. There were a group of Italians who made a colony in Ethiopia (now known as Italians of Ethiopia), following the capture of Abyssinia by the Italians in 1936.