Step 1 : Introduction to the question "Root beer is traditionally made using the root bark of what tree?"
Root beer is traditionally made using the root bark of the sassafras tree, which provides the main flavor for the beverage. Sassafras, native to North America, has long been valued for its aromatic qualities and distinctive flavor. However, due to health concerns associated with safrole, a compound naturally found in sassafras that was linked to potential carcinogenic effects, most commercial root beers today use artificial sassafras flavoring instead. Despite these changes, the legacy of sassafras remains central to the history of this iconic beverage.