American food went from millions of backyard gardens and local butchers to a few giant plants that feed the whole country. Refrigerated rail, the Chicago disassembly line and national brands built enormous efficiency, along with exposed choke points. The 2020 pandemic closures showed what happens when one fails.
The claim that victory gardens supplied 40 percent of fresh vegetables rests on wartime estimates without a clean primary source. Beef concentration figures differ by method, and whether concentration causes more outbreaks or just bigger ones is argued.