Long before the 30-second commercial or the full-page ad, there was the poster. For more than two centuries, the U.S. has been using colorful placards and broadsides to implore the people to do the right thing, from preventing forest fires to keeping mum about military secrets during wartime. Last week 117 examples of this perennial propaganda tool, drawn by the likes of Thomas Hart Benton, Ben Shahn and Norman Rockwell, went on display at the National Archives in Washington in a new exhibition called "Uncle Sam Speaks." The show will run for a year.
The oldest document in the exhibition is...
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