> There were certainly interactions going on between cultures in Europe and the Middle East in ancient times
Sure.
> and Greek culture was certainly influenced by Egyptian, Mesopotamian Persian cultures (which are often not considered "Western")
No doubt about it. Especially ancient egyptian civilization. The ancient greeks themselves have said so.
> but for example China
There was some contact, but certainly not as much between mediterranean peoples. That's obvious.
> the Americas had no direct contact with Europe until much later and developed in isolation to each other.
Who cares?
What's your point? Your comment didn't address what I wrote. I said there is no such thing as western civilization. Just like there is no such thing as eastern civilization. Not sure what the point of your comment is.