KANSAS: ICEEs
Omar Knedlik of Coffeyville, Kansas, didn't have a soda fountain in the Dairy Queen he owned (according to some accounts his was broken), so he put bottles of soda in the freezer to keep them cold. When he served customers half-frozen sodas, they couldn't get enough.
In 1958, he invented a new kind of soda machine, a cross between an automobile air conditioning unit and an ice cream machine, and called the slushy sodas "ICEEs." 7-Eleven began installing the machines in their stores in 1965.