what they're doing is making up a new hypothetical continent consisting of the US, China, Europe, India, Japan and comparing that to Africa. I think it works t

what they're doing is making up a new hypothetical continent consisting of the US, China, Europe, India, Japan and comparing that to Africa. I think it works to show how big Africa is. But yes, if you compare countries, you can take comparisons further, and it would be more practical.