On Eurasia
Sorry! As some of the other notes have said, I meant this sort of thing: “Of course. Asia and Europe aren’t even a separate landmass, after all.” (on your Europe tag) -> arbitrary line down the Eurasian continent of ‘other’?
As for "arbitrary", it doesn't mean "completely random". Everything named by humans serves a purpose for humans, in this case presumably Europeans, since they were the ones who decided they were separate.
I can only speak to American ideas about this, after all. In the U.S. the idea that Europe was completely culturally and geographically isolated (and racially isolated) for pretty much the entirety of human history is very popular and widely accepted. It's also not true.
How this belief can co-exist with The Silk Road also being (fairly) common knowledge, I don't really understand. And the Crusades. And the Roman Empire. And the Mongolian, Ottoman, and Byzantine Empires. Vikings. Al-Andalus.
I mean, this is exactly how it goes: A film or show comes out cast entirely with white people, even though it's meant for a pretty diverse American audience.
Viewers and fans of color are like, "wow, why isn't anyone who looks like me on this show, or on TV/in movies, like, ever?"
White fans are like, "how dare you? It's a European [inspiration/source/book/fairy tale]. Everyone to the last person, every single last human, in Europe was white back then (pretty much no matter when. or where.)"
I'm like, "That doesn't make any sense if you think about it for two seconds, for about a million reasons (supernatural elements in the source, documented historical precedence, source being 100% fiction, historical facts, et cet)."
The supposed isolation of Europe during previous eras is used to perpetrate and excuse violence and racism in America, right now.
It shouldn't be controversial to point out that Europe and Asia are literally the same landmass:
But in this context, it becomes very relevant, and sadly, controversial. I'm pretty bad with geography, but I'm not that bad.
All I'm actually saying is, "you may notice you can get to Europe by walking there from almost anywhere in Asia."
but at the same time, no people of color, ever?
And this isn't even getting into the whole "people had boats since 5ever" factor. Australia has been populated for 40,000-ish years, after all.
So we come back to the question: What separates Asia and Europe? The answer is, essentially, nothing. Another answer is: human social constructs. Yet another answer is: distance. Another: a political boundary.
But maybe we get a little more mileage out of NEW questions: What purpose does this boundary serve, and whom does it serve? What ideas are attached to it? Why do we care?
Like I've said, I'm American and I can't speak for Europeans. I've never claimed to, but I find their (your) input quite valuable.