The Great Depression was a time of lean years for many in the United States as well as all over the world. Many people learned valuable lessons on how to make food stretch and take advantage of cheaper processed food that came out during this time. Many people learned to survive on less and some people went hungry.
When World War II came around, many of these lessons were needed to survive the war and stretch their rationing coupons. People were encouraged to garden during the Depression and were heavily encouraged to do during the war. Victory gardens appeared everywhere to help feed the people while more and more food was shipped to overseas.
Many of these lessons learned during these eras have been lost. We as a people are incredibly wasteful now. Our grocery budgets would be better off if we learned these same lessons and kept them in our kitchens. Then if we have lean times, we would be better off.