Root beer is a carbonated, sweetened beverage, originally made using the root of a sassafras plant (or the bark of a sassafras tree) as the primary flavor. Root beer, popularized in North America, comes in two forms: alcoholic and soft drink. The historical root beer was analogous to small beer in that the process provided a drink with a very low alcohol content. Although roots are used as the source of many soft drinks throughout the world, often different names are used. There are hundreds of root beer brands in the United States, produced in every U.S. state, and there is no standardized recipe. The primary ingredient, artificial sassafras flavoring, is complemented with other flavors. Common flavorings are vanilla, wintergreen, cherry tree bark, licorice root, sarsaparilla root, nutmeg, acacia, anise, molasses, cinnamon, clove, and honey. Although most mainstream brands are caffeine-free, there are some brands and varieties that contain caffeine. Homemade root beer is usually made from concentrate, though it can also be made from actual herbs and roots. Both alcoholic and non-alcoholic root beers have a thick and foamy head when poured, often enhanced by the addition of Cassava
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