Every year on September 18, National Cheeseburger Day is celebrated. On this day, the entire United States comes together to enjoy one of the most famous delicacies. Everyone loves that mouthwatering dairy palooza of flavor as a topping. These cheeseburgers were invented in 1924 when a 16-year-old boy named Lionel Sternberger decided to experiment with putting cheese on a hamburger. He later gave the burger the name 'Cheeseburger.'