Many of the resources required by printers suddenly became difficult to find or denied to them completely as they were diverted towards war production.
Even so postcards continued to be manufactured and purchased for they played an important role in keeping up wartime morale, and were also an important tool in spreading propaganda.
The war years themselves really need to be looked at as a closed interim period in regard to postcards, for the surrounding events did not follow any sort of historical progression.
While the new circumstances had great influence on postcards, they just suddenly appeared and then ended.
Ordinary view-cards for tourists had become the dominant trend leaving news events to be covered by other media.
By 1913 the postcard market had bottomed out as cards were dumped at discount prices, and poorer quality cards were already beginning to become dominant.Postcard subjects reflected this attitude by becoming generally light in nature.While the San Francisco earthquake caused a multitude of postcard images to be produced, the more widespread disaster of the great 1927 Mississippi flood just nineteen years later barely had any effect on card production.Despite the difficulties of producing cards in wartime, printers also found new opportunities as new needs arose.On top of already declining postcard sales spurred by high tariffs, the flow of cards from Germany and Austria-Hungary were cut off from the American market by the war.