Why must most milk sold in the U.S.be refrigerated at all times while evaporated canned milk and milk in cardboard containers sold in Europe do not need to be refrigerated until they are opened?

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The Answer of Why must most milk sold in the U.S.be refrigerated at all times while evaporated canned milk and milk in cardboard containers sold in Europe do not need to be refrigerated until they are opened?

Why Must Most Milk Sold in the U