The donuts, which were developed during World War I, soon became popular in America after the war. and a mass production system was developed. In the 1930s, many American restaurants were selling machine-made gifts. And at the 1934 Chicago World's Fair, donuts were called. First, though, donuts are widely regarded as "the best selling food of the century." But it still can't stop Americans from loving it. Hundreds of our stores sell dozens of different donuts. Tourists line up early in the morning before going shopping. And many people buy large boxes to share with work and colleagues.Many Americans love to make donuts at home. Because the basic donut recipe is simple. The ingredients are therefore very diverse. From traditional chocolate syrup and ice cream to berries, raisins, nuts and even oriental flavors borrowed to make donuts. Most people share donut recipes online, and interested readers can try making their own.