When did popcorn appear? Who invented it? Is it from China or foreign?

Obviously, popcorn is an ancient puffed food in China, and its origin can be traced back to the Song Dynasty. At that time, Fan Chengda, a poet, mentioned the custom of exploding the valley in Wuzhong on the Shangyuan Festival in his Collection of Shihu, and explained: "The glutinous rice is fried in Ibrahimovic, and the grain is called Bulou, and the northerners call it glutinous rice flower." At this time, western countries have not yet entered the industrial age. . .