The West is a sort of abstract version of “Europe”, which in turn is a secularized version of [Christendom]. As such it is not completely clear what it is or was, except that it wasn’t the “East” (thecommunist world) or the “South” (the Third World). It included New Zealand but not Argentina, for example, and didn’t exclude Japan. See David Gress’s From Plato to Nato for an account of the development of the idea and of the thing itself.
During the Cold War period many conservative and neoconservative publicists pushed “The West” or “Western Civilization” as the main object of conservative loyalty. The impulse has died down somewhat with the collapse of the Soviet Union, the extension of NATO and the EU, continuing mass third-world immigration, the general triumph of multiculturalism, and increasing friction between Europe and the United States.