The postcard was a perfect vehicle for propaganda. Postcards dominated communication in the early 20th century and were inexpensive to produce and could be sent cheaply and quickly. In 1905, over seven billion postcards were mailed worldwide. It is not surprising that postcards became a common medium for propaganda.
Only three days after the declaration of war in 1914, postcards with war themes were being published and distributed. Postcards were effective at spreading propagandistic messages to the masses in a very personalized way.