A 1 square mile state that produced nothing but wheat would beat any other state in terms of “amount of staples produced per square mile,” but it wouldn’t be able to sustain a population. That’s not a useful metric.
And it’s even dumber to assess the importance to the nations food supply based on dollar values. California makes a lot of money off of almonds and avocados, which are high priced luxury foods. Of course it will have high revenues attached to it. That doesn’t make it more important to the nation’s food supply than states that produce the staple foods of wheat, corn, beans, chicken, and beef.