White Castle recently surpassed a major milestone: all-time sales of its burgers — The Original Slider, Cheese Slider and Jalapeno Cheese Slider — just eclipsed the 29 billion mark. That includes Sliders sold in restaurants and through food retailers nationwide.
In 1921, White Castle became the first fast-food hamburger chain in the U.S., introducing customers to the small-sized hamburger that would become known as The Original Slider. Forty years later, in 1961, White Castle became the first fast-food chain to reach 1 billion burgers sold.