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Yes superman is the leader of justice league
Superman is a founding Member of the Justice Society, the Justice League, and the Legion of Superheroes
because superman is tougher than everyone
Superman is the strongest Justice League member.
Fight for truth and justice, alongiside Superman, Batman and the rest of the justice league.
He was believed dead in Hereafter.
Superman and then The Flash and Hawk girl
Justice League DoomJustice League The New FrontierJustice League Crisis on Two EarthsJustice League Adventures Trapped in TimeJustice League Gods and MonstersJustice League Part One (Theatrical 2017)Justice League Part Two (Theatrical 2019)There are also Lego Justice League movies Justice League vs Bizarro LeagueJustice League Attack of the Legion of Doom
superman
Justice League Superman would win. He would fly to the Hulk and pull him to the ground and then up and throw him onto a mountain and kill him.
Naturally there is no definitive answer but it can be assumed that if he was simply shown as the strongest, fastest, smartest, most powerful being, there wouldn't be any need for the other heroes in Justice League for instance & there would be no conflict he couldn't easily eliminate in Superman the Animated Series.
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