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By Ben Cosgrove
!["I Want You . . ." World War I recruitment poster; James Montgomery Flagg, artist.](https://api.time.com/wp-content/uploads/2014/06/140619-loc-wwi-poster-02.jpg?quality=75&w=2400)
![World War I poster; Harry Hopps, artist; c. 1917.](https://api.time.com/wp-content/uploads/2014/06/140619-loc-wwi-poster-01.jpg?quality=75&w=2400)
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