The Golden age not end.

The Golden Age of Comic Books was a period in the history of American comic books, generally thought of as lasting from the late 1930s until the late 1940s. During this time, modern comic books were first published and enjoyed a surge of popularity; the archetype of the superhero was created and defined; and many of the most famous superheroes debuted, among them Superman, Batman, Captain America, and Wonder Woman.
The popularity and circulation of comic books about superheroes declined following the Second World War, and comic books about horror, crime and romance took larger shares of the market. However, controversy arose over alleged links between comic books and juvenile delinquency, focusing in particular on crime and horror titles. The result was a decline in the comics industry.[3] To address public concerns, in 1954 the Comics Code Authority was created to regulate and curb violence in comics, marking the start of a new era.[
But What if the Superheroes don't decline in late 40s?
Maybe a some type of Comic code can be created in 1945-46.
Others ideas?

P.S.
Why in OTL the superheroes declined in late 40s?
 
Not a comics expert but part of it is a loss of interest in "superheroes" after WWII ended with a growing interest in "adventure" comics (westerns, scifi, horror, etc.). Just as Superheroes pushed aside detective and cartoon comics in the 30s. Part of shifting interest in the consumers...natural thing.

The Comics code, IIRC, reacted to the growing violence, occult, and implied sex showing up in comics in the 50s. My dad remembered a comic book with a diagram showing all the "soft points" on a man where you could kill him with your hands, frex.

I think some end of the "Golden Age" is likely no matter what, but you could have some new revolution in superhero portrayals that keeps them "fresh" in the public mind (an earlier Stan Lee type figure creating "teams" or "imperfect heroes"?) or butterfly the comics code by some different Congressional bogeyman or internal policing by the comics companies. I think this just means an earlier "silver age", but kind of fulfills the OP.
 
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