The Comics Code Authority (CCA) was formed in 1954 by the Comics Magazine Association of America as an alternative to government regulation. The CCA enabled comic publishers to self-regulate the content of comic books in the United States. The code was voluntary, as there was no law requiring its use, although some advertisers and retailers looked to it for reassurance. Some publishers, including Dell, Western, and Classics Illustrated, never used it. Its code, commonly called "the Comics Code", lasted until the early 21st century. The CC formation followed a moral panic centered around a series of Senate hearings and the publication of psychiatrist Fredric Wertham's book Seduction of the Innocent.

An American comic book is a thin periodical originating in the United States, on average 32 pages, containing comics. While the form originated in 1933, American comic books first gained popularity after the 1938 publication of Action Comics, which included the debut of the superhero Superman. This was followed by a superhero boom that lasted until the end of World War II. After the war, while superheroes were marginalized, the comic book industry rapidly expanded and genres such as horror, crime, science fiction and romance became popular. The 1950s saw a gradual decline, due to a shift away from print media in the wake of television and the impact of the Comics Code Authority. The late 1950s and the 1960s saw a superhero revival and superheroes remained the dominant character archetype throughout the late 20th century into the 21st century.