This history of US comics divides into 4 distinct periods:
https://www.youtube.com/watch?v=If2RbK9vUhU&t=256
Golden Age: 1938-1950
After the Great Depression and WWII, patriotic heroes fighting "foreigners". Violence and crime are abundance.
Silver Age: 1956-1970
Comics Code Authority established to regulate contents of comics. Crime, horror and sex is regulated.
Bronze Age: 1970-1985
The Code was ignored by comic publishers and comics addresses social issues. Tony Stark dealt with his alcoholic issue, Gwen Stacey dies ...
Modern: 1985-today
More focus on the mental beings of the heroes and villains.
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1616: Ultimate Universe (MCU based on this)
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DC adopts the parallel universe concept, first in Flash, in order to crossover heroes of different origins.
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