it seems to me that north and south america (setting aside central for a moment) are as much of "a whole continent" as what you might call "afro-eurasia". we'r

it seems to me that north and south america (setting aside central for a moment) are as much of "a whole continent" as what you might call "afro-eurasia". we're talking entirely different tectonic plates - plates that don't even touch. plates that will eventually shift such that you there will be no possible land travel, and a widening gulf (admittedly in the distant future). not to mention different cultures, hemispheres, etc.