> Where have you seen it used outside of Americans
Well, there was this minor thing called "the western roman empire" for a few years, so that might be a starting point.
I am fascinated to learn how a claim that westerners "prefer liberty over security" is somehow erasing your culture though.
I lived in Germany for a while. Germany is definitely a part of "the West", have been the defining border with "the East" in the Cold War. Germans do not share a cultural viewpoint about liberty and security with the USA. So claiming that westerners "prefer liberty over security" while also including Germans (and others) in the definition of "the West" is absolutely erasing their culture.
I got that bit from wikipedia, it amused me.
As for germans, if they do not share such a viewpoint (and now I want evidence either way), the claim about the west is merely wrong, not "cultural erasure".
The original claim was something about liberty and security and no one in this chain seems interested in bringing in any actual specifics about who thinks what where.
I generally prefer the term "Anglosphere" to refer to only the bits of "the West" that share that cultural viewpoint when I'm discussing cultural matters. It's not perfect, but it's useful.
Given the widening gap between the USA and Europe (and Canada) in economic and military matters, I'm not sure how much longer "the West" is going to be useful.