Original: Canned spaghetti, kits for making spaghetti, and spaghetti with meatballs became popular, and the dish has become a staple in the U.S.
Simplified: In the United States, there is a kind of spaghetti called "Alvaro's spaghetti" which is served with alfredo sauce. In some countries, like United States or Canada, meatballs are often in the spaghetti sauce.