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Why was the Sentinels of Liberty fan club important to Captain America’s early popularity?

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The "Sentinels of Liberty" fan club was instrumental to the early success of Captain America because it fostered deep audience identification with the character.1

Introduced in the first issue of Captain America Comics in 1941, the club allowed young readers to join for a dime, providing them with a membership card and a metal badge. This promotion was so successful that it eventually had to be discontinued due to wartime metal rationing. By creating a tangible connection between the readers and the hero, the club helped solidify the comic's status as one of the most widely read titles of the Golden Age.1