why USA is called by "Western" not "Eastern"? The earth is round anyway?

The term 'the West' is relative to human history, NOT an actual marker, such as the Prime Meridian or the hemispheres. The meaning has changed from time to time, but the term 'West' today can be most closes traced back to maps of the Old World, on which the American continents did not exists and most of what we would consider our common European ancestry (England, Spain, etc) would have been on the 'western' edge of the map. The term stuck as these powers expanded due to the simularities in languge and culture between the powers and their colonies (AKA the United States). During the Cold War, the term 'the West' took on new meaning to mean those countries literally on the West side of the Iron Curtain (again America, Western Europe) and those on the East (Russia, China). Today, the 'Western world' consists of all countries whose institutions, technology, material comfort, market systems, common western European ancestry and overall customs, dress and tastes are sufficiently simular to be grouped together (often called 'Western civilization').

it is actually a western philosophy... started by the ancient greeks. look at wikipedia.org on western philosophy

London neutral as that is GMT and then all west of that should be western and all east is eastern...technically speaking anywho

The USA is west of the prime meridian which is the line of demarcation btween east and west. The equator determines northern and southerm hemispheres.