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Beer contains grains, but is not a grain itself.
There is a liquor store on downer 2600 block I believe where I find it regularly
It's the same as all regular American lagers, in the upper 4% range. Light beers are barely 4%, ice beers are upper 5%.
Yes it is.
The "Grain Belt", or "America's Breadbasket", or in the case of corn "The Corn Belt".