The current orange-flavor formulation of Fanta was developed in Italy in 1955.
Fanta’s earlier history began in wartime Germany. In 1940, Coca-Cola’s German operation created a substitute drink after the war and trade restrictions made Coca-Cola syrup difficult to obtain. That original Fanta used available ingredients such as whey and apple pomace and was different from the orange soda most people recognize today.
After production of the wartime formulation ended, a new orange version was developed in Naples, Italy, in 1955. The Italian beverage used oranges and became the basis for modern orange Fanta. This is why Fanta can be described as having German origins while its familiar orange formulation has Italian origins.
The Coca-Cola Company acquired the Fanta brand in 1960 and subsequently distributed it internationally. Recipes still vary by market: some versions contain orange juice, while others rely more heavily on flavorings and do not use the same ingredients. The question refers specifically to the current orange-flavor formulation, not to Fanta’s original wartime creation.