I had to look this up to be accurate before answering, but the way it was taught to me is the Four Freedoms were memorialized a month after Pearl Harbor when F.D.R. gave a State of the Union address with that theme. With the nation at war the artist Norman Rockwell took up that cause and produced a series of Four Freedoms that became posters, the aim was to sell war bonds. According to the Rockwell Museum, the Four Freedoms raised over $132 million. The paintings—Freedom of Speech, Freedom of Worship, Freedom from Want, and Freedom from Fear, became icons. In an interview published by the Saturday Evening Post, Rockwell stated he had no interest in debating the First Freedom--The Freedom To Keep Arms--as it was obvious all others are dependent. He then quoted George Orwell and said "...that rifle on the wall is the symbol of democracy and it's our job to see that it stays there.”
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Of the set, this is the poster I have always liked best.