why is apple cider vinegar called that and not simply apple vinegar?!

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Apple cider is the juice of uncooked apples. When the sugars in apple cider are consumed by yeast, vinegar and carbon dioxide are created. Wine vinegar is made by exposing it to oxygen which changes the alcohol to vinegar. White vinegar is made by exposing 95% pure alcohol to oxygen then diluting it to 5% original strength.
Learn more about cider vinegar.
http://altmedicine.about.com/od/applecid…

"Apple cider (sometimes soft or sweet cider) is the name used in the United States and parts of Canada for an unfiltered, unsweetened, non-alcoholic drink made from apples. It is opalescent, or opaque, due to the fine apple particles in suspension, and may be tangier than conventional filtered apple juice, depending on the apples used.[1] . . .

Some individual states do specify the difference. For example, according to the Massachusetts Department of Agricultural Resources "Apple juice and apple cider are both fruit beverages made from apples, but there is a difference between the two. Fresh cider is raw apple juice that has not undergone a filtration process to remove coarse particles of pulp or sediment. Apple juice is juice that has been filtered to remove solids and pasteurized so that it will stay fresh longer. Vacuum sealing and additional filtering extend the shelf life of the juice."[

http://en.wikipedia.org/wiki/Apple_cider