Since the introduction of the modern comic book format in the 1930s with Famous Funnies, the United States has been the leading producer, with only the British comic and Japanese manga as close competitors in terms of quantity of titles (although Japan far outweighs America in overall sales). The majority of all comic books in the U.S. are marketed to young adult readers, though they also produce titles for young children as well as adult audiences.
The history of the comic book in the U.S. is divided into several ages or historical eras: The Platinum Age, The Golden Age, The Silver Age, The Bronze Age, and The Modern Age. The exact boundaries of these eras, the terms for which originated in fandom press, is a debatable point among comic book historians.
The Golden Age is generally thought as lasting from the introduction of the character Superman in 1938 until the early 1950s. During this time, comic books enjoyed considerable popularity; the archetype of the superhero was invented and defined, and many of the most popular superheroes were created. The Platinum Age refers to any material produced prior to this.
Since the invention of the comic book format in the 1930s, the United States has been the leading producer with only the British comic books (during the inter-war period and up until the 1970s) and the Japanese manga as close competitors in terms of quantity.
Comic book sales began to decline after World War II, when the medium was competing with the spread of television and mass market paperback books. In the 1960s, comic books' audience expanded to include college students who favored the naturalistic, "superheroes in the real world" trend initiated by Stan Lee at Marvel Comics. The 1960s also saw the advent of the underground comics. Later, the influence of Japanese manga and the recognition of the comic medium among academics, literary critics and art museums helped solidify comics as a serious artform with established traditions, stylistic conventions, and artistic evolution.
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