In what year was the first full animated film made?

"Snow White and the Seven Dwarfs" (1937) is the first American full length animated film. The first worldwide were "El Apostol" (1917) and "Sin Dejar Rastros" (1918) but both are considered lost. "Die Abenteuer Des Prinen Achmed" (1926) is the oldest full length animated film that still survives. It was animated in silhouette.