It’s true what they say, everything’s better with cheese. This includes the beloved hamburger, changed forever when it made the journey from Germany to the United States. There is some disagreement about when the cheeseburger was invented, but most sources agree that it was in the US in the early 1900s. Whatever its origins, the cheeseburger has become one of the most beloved sandwiches in the world, classic at diners and fast food restaurants everywhere. Cheeseburger Day celebrates this popular meal each year.