Conversation so far:
Who are The Avengers?
The Avengers are a fictional team of superheroes appearing in limited series comic books published by Marvel Comics. ... Labeled Earth's Mightiest Heroes, the Avengers originally consisted of Ant-Man, the Hulk, Iron Man, Thor, and the Wasp.
Tell me about The Avengers' first appearance.
First appearance The Avengers #1 (September, 1963)
Who is the most powerful of The Avengers and why?
Thor. Although stronger than most of his mortal teammates, Thor is far from the strongest Avenger.
What is the relationship of Spider-Man to The Avengers?
While Tom Holland's Spider-Man was “knighted” as an Avenger by Tony Stark (Robert Downey Jr.) in Avengers: Infinity War
Why is Batman not a member of The Avengers?
Why isn't Batman an Avenger? Simply put, because he is a DC character and not a Marvel character.
What is an important team in the DC universe?
Tell me about the origins of the Justice League in the DC universe.
Originally consisting of Superman, Batman, Wonder Woman, The Flash/Barry Allen, Green Lantern/Hal Jordan, Aquaman and the Martian Manhunter, they first appeared together as the Justice League of America (JLA) in The Brave and the Bold #28 (March 1960).
Who are the important members of the Justice League?
The seven original members of the Justice League pictured from left to right: Green Lantern, Flash, Superman, Batman, Wonder Woman, Aquaman and Martian Manhunter.

Question: Which team came first
Self-contained rewrite: Did the Justice League or The Avengers come first?