Well, beyond America, I was thinking on the rough commonalities in culture among predominantly white nations from Scandinavia,thoughout Europe, to Russia, Canada, etc.
Whatever common traits and tendencies there are among these nations(other than their currently declining, dying populations) might fairly be called 'white culture'(or 'western civilization'?).
It's hard to say how much that cultural commonality among predominantly white nations matters. Maybe only the particular cultures of individual nations matters much. But I've heard of Arab countries, Latin countries, Pan-Africanism etc. and those commonalities seem to matter to them.
I am not so sure you are not talking about white race rather than white culture. I agree it is the American culture. As a matter of fact on the border, the race is approximately 95% Hispanic or Latino. I think nothing of it.
On Christmas I eat turkey and hot tamales. That is a blending of the cultures but two separate cultures. My turkey matters to me.LOL
I also agree with Ohioan that this is a NWO goal. These 2-bit lords would like to make everyone interdependent.
As you are talking about the dying white culture, (I disagree) as I think you mean race, always remember the lowest form of life, the snake, multiplies.
That would include Spain and most of Latin America since hispanic is a culture and not a race. Most hispanics are considered Caucasian by definition. The new definition of hispanic as a race is a result of trying to give them a special status.
That said, I really am having a hard time understanding your question. Any "white culture" would be called that simply by its inhabitants. I don't think there is a "white culture" that definitively defines "white". The "white" cultures around the world have a incredibly diverse way of living.