In terms of the Americas, like it or not, North and South America are separate continents and always have been – both politically, and geographically – they’re even located on different tectonic plates and at one time were completely separate. If you look back, at one time, the “supercontinent” of Gondwana consisted primarily of what have now become South America, Africa, Antartica, Australia, and the Indian “subcontinent” (which was not originally connected to Aisa). And “Oceania” is not a continent, it consists of parts of what broke off from Asia and parts of what broke off from Gondwana, and is not on a separate tectonic plate (which is what defines the separate continents… hence “continental drift”).

Central America has always been a bit of a mystery as to where it belonged – I’ve heard arguments for both, or even splitting it up, but I’d say that politically anyway, it is usually considered part of South America.

I enjoy your comments, but at time you are a bit too much US centric. South, Central and North America are not separate continents but three subcontinents of the same one.
So we have (alphabetically):
Africa
America
Antarctica (McD free)
Asia
Europe
Oceania.

Keep your blog coming. I’m really enjoying it.

Gustavo