I was thinking about possibly rebooting one of my timelines and am currently brainstorming about the world, specifically colonization. I was wondering about the colonization of Africa. With a POD in the 17th century, is it possible for large parts of Africa (I am think of for example the Sahara desert) to remain uncolonized (or even claimed) in the early 20th century, even if large parts of Asia and the America's are colonized?