Minute Maid 100% Orange Juice IS unadulterated oranges (pulp adds texture, not nutrition). Proof is looking up what's in raw oranges. 100g of raw oranges contains 90% RDA of Vitamin C and 4% RDA of Calcium . Minute Maid Orange Juice with Calcium boosted the Calcium content up to 35% RDA.
Japan has a brand of Coca-Cola with Vitamins added. But after the spanking the company went though with "New Coke", it's unlikely the formula is doing another change in the U.S..