Sarah Sundin notes a number of interesting things on her blog, including the Rosenstraße Protest in Berlin, in which gentile women married to Jewish men took to the streets to demand the return of their husbands. Ultimately, 1,800 men were released.
She also notes the U.S. Office of Price Administration implemented rationing of canned goods. Canned meats were wholly unavailable.
As Sundin explains on the rationing link on her blog, the rationing was designed to save tin, not food. It did serve to emphasize growing your own food and preserving it at home, however.
When I was a kid, vegetables that we had that weren't home-grown, were usually canned, probably expressing the habits of my parents. Frozen vegetables were available, but we usually didn't get them. When my father started a very large garden in the 70s, however, we froze peas ourselves, which only worked so so.
Commercially frozen vegetables weren't really a thing until the Birdseye company started its "flash freezing" process in 1929. The popularity of frozen foods expanded during World War Two, but collapsed again after the war. Interest started to recover in the 1950s, and then took off in the 1960s. Personally, I didn't really wasn't exposed to them much until the 1980s, when a university girlfriend was shocked that I bought canned peas and canned corn, as frozen was so much better.
Frozen really is better.
