There was a time called the Cold War. US strategy during the Cold War was most likely behind the creation of this poster is Propaganda.
Propaganda during the Cold War was said to be at its peak during the 1950s and 1960s, which was the early years of the Cold War. The United States often make propaganda that aim;
The American government was known to have dispersed propaganda through the use of movies, television, music, literature and art etc.
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