And Africa is more than twice the size of Europe, it is fair to complain that they don’t just put Ghana in the title. It is not that the title is unacceptable but it is just wrong and weird
Maybe the English-speaking world. I think most people couldn't place Canada on a map. More people than Ghana or any African country, certainly, but that's because it's more famous. GDP is more correlated to this than population or landmass.
I'm not justifying anything. I also think it's more polite to say "Ghana" rather than "Africa". I just don't agree with the arguments.
Canada is the second-largest country in the world, so if you know that it's in the north and, um, not Russia, you stand a pretty good chance at picking it out. (Doubly so if you just know it's in the Americas.)
Now, if you asked the same about Pakistan or Nigeria (#5 and #6 in terms of population, but far smaller and with far shorter sea borders), I'd bet that far fewer people would be able to pinpoint those with the same accuracy (whether in the English-speaking world or not).
I am fairly certain that most people in the non-English speaking world will also be able to place Canada on the map - I'd assume the French know exactly where Canada is. But I digress; it's not about placing a country on a map. It's more about we know that Canada is a separate country, and it has an identity distinct from other countries in its continent.
This goes beyond mere politeness; that you used this word is a bit suggestive. Refusing to acknowledge an identity is far more than just a lack of politeness.