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Posters, specifically called propaganda posters, designed to raise morale and reinforce defense themes, cropped up in public places in World Wars I and II. Many were colorful and attractive, undertaken by name-brand artists. They reminded Americans why they were fighting and what the fight was for.

Former York, Pa., mayors Charlie Robertson, left, and John Brenner, right, throw out the first pitches with current Mayor Kim Bracey during the York Revolution season opening game at Sovereign Bank Stadium on April 29, 2011. The trio were invited to the ceremony because of their roles in bringing professional baseball back to York.