In what U.S. state was the restaurant "Steak 'n Shake" founded?

"Steak 'n Shake" is an American casual restaurant chain located primarily in the Midwestern and Southern United States with locations also in the Mid-Atlantic and Western United States, Europe, and the Middle East. Steak 'n Shake Operations, Inc. is headquartered in Indianapolis, Indiana. Many "Steak 'n Shake" restaurants are open 24 hours a day, seven days per week. The menu features primarily hamburgers and hand-dipped milkshakes, though other entrees, side items, and drinks are also available. There is no steak on the menu. The corporation's slogan "Famous for Steakburgers" refers to its most prominent food item, the "Steakburger", so called because it was originally made from a mixture that included T-bone, sirloin, and round steaks.

Gus Belt (born in Morrisonville, Illinois) founded Steak 'n Shake in Normal, Illinois in February 1934, after serving four years in the United States Marine Corps. He converted the combination gas station and chicken restaurant that he owned (Shell's Chicken) into a hamburger stand. The original building at the intersection of Main Street and West Virginia Avenue was damaged by a fire in the early 1960's, but it was repaired and its dining room expanded. Besides the U.S., "Steak 'n Shake" restaurants can be found in the United Kingdom, France, Spain, Italy and Portugal.