Also, towards the end of the 19th century and beginning of the 20th, many Asians (mostly Japanese) began to emigrate seeking for better life conditions. However, some countries began to block them (like the US and Australia), so they went to those countries that didn't blocked them (like all of South America).
That's all beside the point, though. At which point does a person cease being someone's descendant because the majority of their other ancestors have been placed in some other category? Most of my ancestors were not Native American, but I don't feel like that makes me any less a descendant of my Cherokee great grandmother.
I'm surprised that there were so many South American countries.
Aren't they part of Oceania?