Corn does grow in a lot of places that sugar can’t grow. Odd thing is that throwback soda (real sugar) is the same price as corn syrup based soda.
Sugar cane, maybe, but sugar beets grow just about anywhere. There's a ton of beets grown for sugar in southern Idaho and eastern Oregon. There are at least three plants in those areas that process them. Most of the processing is done from December - March, with the plants idle much of the rest of the year.