The hamburger's name originates from Hamburg, Germany, where a 'Hamburg Steak'—a patty of minced beef—was a popular dish. However, the transition to placing the patty inside a bun happened in the United States. One popular claim belongs to 'Hamburger Charlie' Nagreen, who in 1885 sold meatballs at a county fair in Wisconsin. Realizing customers wanted to eat while walking, he smashed the meatballs flat and placed them between bread slices. Another claim comes from Louis' Lunch in Connecticut (1900), which still serves burgers on toast today. The hamburger gained massive fame at the 1904 St. Louis World's Fair. By the mid-20th century, the rise of the automobile and 'drive-in' culture solidified the hamburger as the ultimate global fast-food icon.