During World War II, bakers in the United States were ordered to stop selling sliced bread for the duration of the war on January 18, 1943. Only whole loaves were made available to the public. It was never explained how this action helped the war effort.
(The Amazing Book of Useless Information)
Probably because the machinery that cut them was taken a part and put to a different use.
Or there were no great things so they didn’t want to compare them to sliced bread.
