Assuming you're talking about geopolitics, "the West" is colloquially used to refer to the imperialist countries, most of which are located in the "western half" (arbitrary, of course), but it doesn't include South America or the western part of Africa, and it does include Australia, New Zealand, Japan, and Occupied Korea, all of which are in the "eastern half". "Global north" might be a better alternative but it's not completely accurate