I have a book called “The Last days OF The LATE Great State OF Calif”
Had it for years.
Topic is the agricultural production of the state & who buys it all.
Here’s a PDF touching on California exports.
One thing it doesn’t touch on, is Californa’s total
production vs how much it exported. It could be that
while California is a large exporter, it could also
still be selling plenty across the U. S. also.
https://www.cdfa.ca.gov/Statistics/PDFs/2022_Exports_Publication.pdf