These are not official state foods. They are what the source website has decided to appoint as the favorite food for each.
This is a list of official state foods:
https://en.wikipedia.org/wiki/List_of_U.S._state_foods
EDIT: Corrected link; source page is down and had originally linked to wrong page. Used archive.org to get to original.
https://en.wikipedia.org/wiki/List_of_U.S._states_and_territories_by_historical_population
According to this, Nevada only had 110k people statewide in 1940.
In 1940, New York City had 7.5 million.
Gotta have people to produce cultural output.