Justice League

Origin
After the events of the Crisis on Infinite Earths, the JLA's New Earth origin differed from the Pre-Crisis origin slightly, most notably the inclusion of Black Canary, the absence of Batman, and Superman single-handedly defeating the last alien but leaving moments before the group arrived. The Post-Crisis founding members of the team being:
 * The Flash (Barry Allen)
 * Green Lantern (Hal Jordan)
 * Black Canary (Dinah Laurel Lance)
 * Aquaman (Arthur Curry)
 * Martian Manhunter (J'onn J'onzz)

In post-Crisis timeline, Black Canary II replaced Wonder Woman as a founding member of the JLA. This had the effect of Wonder Woman not having been present for any of the early JLA adventures she originally appeared in (Pre-Crisis).

Pre-Crisis
The five founding members of the Justice League were Green Lantern (Hal Jordan), the Flash (Barry Allen), Aquaman, Black Canary (Dinah Laurel Lance), and the Martian Manhunter. After each showed up independently to handle an emergency, they decided to stick together and form a new team. Inspired by the Justice Society of America, they decided to call themselves the Justice League of America and announced their new team in a press conference. They decided to consider other recruits, but for the whole first year they operated as just the five of them.

Justice League International
The new Justice League America that formed after the Legends crisis (wherein the New God known as Darkseid embarked upon a plan to weaken the resolve of Earth's faith in the super-hero community) consisted of Doctor Fate, Batman (Bruce Wayne), Mister Miracle, Green Lantern (Guy Gardner), Blue Beetle (Ted Kord), Captain Marvel (although his presence was later retconned with Zero Hour), Black Canary, the heroic Dr. Light, and Oberon. This time, the unscrupulous financier and liaison Maxwell Lord appeared. Justice League America quickly renamed itself to "Justice League International." Captain Atom and Rocket Red joined the team as Captain Marvel and Dr. Fate leave. The team also takes up a new residence, this time in Metropolis.

The team continued to grow until the decision was made to split it into two teams: Justice League International returned to being Justice League America and a new Justice League Europe was formed in Paris. The JLE lineup consisted of Captain Atom as field leader, Elongated Man, Power Girl, Flash (Wally West), Rocket Red, Animal Man, and Metamorpho.

The Watchtower
A new JLA would form after a new villain calling himself Know Man kidnapped Doctor Destiny and used his powerful reality altering abilities to cause many of the world's heroes to briefly forget their superheroic identities. Know Man revealed a seemingly insane plot to transform the entire population of earth into metahumans--a move that he said was necessary to combat an oncoming evil. The world's greatest heroes were on the job, however, and Know Man was stopped and forced to flee.

The then current Justice League, which had essentially been reduced to Metamorpho, Ice, and a couple of others operating out of the Overmind's defunct space ship. That ship was destroyed and Metamorpho seemingly killed after the arrival of the Hyperclan, a team of super powered aliens who arrived on Earth offering to transform the world into a paradise. To that end, they rounded up several super villains and summarily executed, drawing the opposition of Earth's heroes. The Good Samaritan routine quickly proved a sham--the Hyperclan were renegade White Martians. Only by joining together could the heroes defeat them, and afterwards they decided they would be the core lineup of an all new JLA. Using Martian and Kryptonian technology, the team quickly built a new base, the Watchtower, on the surface of the moon.

The team then decided to have a recruitment drive--Hitman, Damage, and Max Mercury did not make the cut, but a mysterious woman named Tomorrow Woman did. She quickly turned out to be a highly advanced android built by T.O. Morrow and Professor Ivo to be a plant inside the League--but they gave her too much free will and she self sacrificed to save the others. Afterwards, she was given a hero's funeral.

The new team soon gets called out to California, where the angel Zauriel has come to earth, pursued by renegade angels working for Asmodel. Soon Asmodel himself shows up and most of the team has to battle him while Superman--currently in his blue energy form--has to stop Neron and the Demons Three from causing the moon to fall out of the sky. Once he's successful, he wrestles Asmodel to a standstill while Zauriel and GL manage to build a device with his power ring that banishes the other angels off the Earth.

Back on the Watchtower, the team is caught off guard and knocked unconscious by the villainous Key. He and his robot minions hook them up to a virtual reality machine, causing each of them to live a different life in VR as part of a plot to take over all of space and time (it's complicated). Luckily, Green Arrow (Connor Hawke) beams up to the Watchtower (he was coming for a second interview) and recovering his Dad's old trick arrows from the Trophy Room he manages to almost single handedly take down Key and his robots. Green Arrow is inducted as a member of the League. Aztek joins the League shortly thereafter, bringing the roster up to nine--briefly, as Wonder Woman shortly dies.

In opposition to the new League, Lex Luthor decides to form a new Injustice Gang, consisting of himself, Circe, The Joker, Ocean Master, Mirror Master, and Doctor Light. Luthor had acquired the Rock of Ages, which granted him extensive power, and built a secret lair for the Gang on an orbiting satellite. Building hard light holograms in the form of the Justice League members, the Injustice Gang commenced an attack on Star City, massacring many people before the League could stop the holograms. During the battle, Aquaman sensed the mind of his brother, Ocean Master, controlling one of the holograms and this helped put the team on the right trail. After taking a timeout to deal with the Genesis event, the League gets back on the trail and soon uncovers the truth about Luthor and his new gang. Green Arrow is corrupted by Circe into becoming a mole, while Batman manages to contact Mirror Master and get him to become a turncoat in the Gang. The JLA also recruits Plastic Man, who manages to also infiltrate the satellite posing as the Joker (after tying up the real Joker). Superman and Martian Manhunter attempt to infiltrate the Gang's lair, only to discover it booby trapped. Meanwhile, Metron arrives and warns the team about Luthor's possession of the Rock of Ages. He takes Aquaman, Flash, and Green Lantern on a mission to Wonder World before promising to return them.

Traveling faster than light, Aquaman, GL, and Flash end up returning to Earth fifteen years in the future--a future where Darkseid has conquered the Earth after the destruction of the Rock of Ages. Their minds assert themselves into their future bodies--Kyle's does not have his power ring, and Wally's is sick and out of shape, causing both of them to despair. Superman and J'onn J'onzz are dead, and Batman has been missing for eight years. Diana, however, is alive and doing her best to lead the resistance against Darkseid, who has converted over half the planet's population into drones with no free will of their own. All that's left of the League aside from Diana are Green Arrow (Connor Hawke), the Atom (Ray Palmer), Argent, a reprogrammed Amazo, and a new Aztek. Breaking into Darkseid's palace, the team discovers that Batman is still alive--he managed to defeat Desaad and has recently assumed his place. Darkseid shows up, and as Diana battles him, Batman manages to seize control of Metron and his Mobius chair, forcing him to send the three time traveling heroes back to the right era. As Diana falls to Darkseid, Argent and Aztek successfully destroy his "zombie factory" on the moon (losing their own lives in the process). Batman is defenseless against Darkseid (who now has a personal forcefield that deflects all attacks) and the Dark Lord strikes him down. That leaves Atom and GA (Amazo is brought down on the way in) but the two most unlikely hereos manage to kill the great Darkseid himself.

Fortunately, none of that "really" happens, as the three heroes are restored to their proper place and prevent the destruction of the Rock of Ages. Luthor even uses its awesome power to bring back to life everyone killed in the Star City massacre. Green Arrow reveals that he never really betrayed the team, he was just allowing Circe to think he had, and after a battle where Mirror Master walks out, the Injustice Gang is defeated--but Lex Luthor is as untouchable as always.

The team briefly considers disbanding, feeling that they might attract more enemies, but decide to stay the course. They recruit new members: Steel, Big Barda, Orion, Plastic Man, Wonder Woman (Hippolyta), and Huntress while inviting the press up to the Watchtower to cover the event. At that exact moment, Prometheus chooses to make his entrance, and he manages to systematically take down the League one by one, exploiting each of their weaknesses, before a humbled Batman is able to finally turn the tables. Zauriel joined the team shortly thereafter.

The JLA had to battle in D.C. against Julian September, who had managed to upset the "odds" in the universe, causing the number seven to appear (i.e. seven villains randomly decided to try and kidnap the President, seven airplanes almost collided with one another). As the cancer on probability began to affect all reality, it also began to affect the past, causing (among other things) Batman to disappear when the gun that would have shot his parents jammed. With the help of the Atom, the League was able to set it all to right, however.

The JLA had to rally behind Superman Red and Superman Blue to defeat the Millennium Giants during the "Behold! The Millennium Giants!" adventure that almost saw the world's destruction. Thankfully, the Man of Steel was able to save the day, and afterwards he was transformed back into his usual self.

Identity Crisis
Identity Crisis, and its immediate fallout, the "Crisis of Conscience", led to the dissolution of the Justice League of America. The breakdown of relationships of Identity Crisis reached its zenith. As in the time of the Detroit JLA, the team disbanded again, leaving it to the Martian Manhunter to again rebuild the team, with Superman's blessing. Meanwhile, following his resignation from the JLA, Batman is confronted by his faithful aide, Alfred Pennyworth, who surmises that the reason why Batman was so outraged over the mind-wiping of Dr. Light and other villains (and himself) was that Catwoman may have also been mind-wiped, and this might have been the reason for her semi-heroic nature in recent years, rather than any positive influence from Batman himself.

Infinite Crisis and Aftermath
Later, someone, recognized by the JLA Watchtower's systems as the Man of Steel, blows the Watchtower apart, in the very moment in which the Martian Manhunter found, and was about to tell the others, a connection between the team dissolution, the rise of the OMACs, the intergalactic war between Rann and Thanagar, the creation of a new Secret Society of Super-Villains and the rampage against magic by the Spectre. This intruder is later revealed to be the Earth-Prime Superboy. So, in the beginning of the Infinite Crisis, the JLA will be disbanded again.

52
Several months later, during the "Lost Year" following Infinite Crisis, Firestorm reorganized the team, inviting Ambush Bug, Bulleteer, Firehawk, and Super-Chief. This League lasted very briefly. Their first and only mission, fighting a renegade Skeets, resulted in the death of Super-Chief, during Week 24.

One Year Later
A year after the disolution caused by Infinite Crisis, Red Tornado's elemental spirit is tricked into abandoning his android body in favor of a human one. The android body is then abducted and modified by supervillains, an act which ultimately causes the ten heroes to assemble and form the new team.

Weapons

 * None Known

Transportation

 * None Known

Allies

 * Agent Liberty
 * Beast Boy (Garfield Logan)
 * Beefeater
 * Black Orchid
 * Captain Comet
 * Catwoman (Selina Kyle)
 * Civet
 * Catherine Cobert
 * Creeper (Jack Ryder)
 * Dove (Dawn Granger)
 * Erewhon
 * Gaius
 * Gunfire
 * Dale Gunn
 * Hawk (Hank Hall)
 * Justice Society of America
 * Kilowog
 * Lionheart
 * Lobo
 * Hannibal Martin
 * Max Mercury
 * Mazing Man
 * Mister Miracle (Shilo Norman)
 * Oberon
 * Osiris
 * The Outsiders
 * Phantom Stranger
 * Jesse Quick
 * Harley Quinn
 * Resurrection Man
 * Retro
 * Sandman (Garrett Sanford)
 * Sargon the Sorcerer
 * Seneca
 * Starfire (Koriand'r)
 * Starman (Will Payton)
 * Starman (Mikaal Tomas)
 * Adam Strange
 * Supergirl (Kara Kent)
 * Teen Titans

Enemies
Too Many to list.
 * Amazo
 * Felix Faust
 * Injustice League
 * Kanjar Ro
 * The Joker
 * Professor Ivo
 * Queen Bee
 * Lex Luthor
 * Secret Society of Super Villains
 * Doctor Psycho
 * Deathstroke
 * Calculator
 * The Key
 * Vandal Savage
 * Kobra
 * Solomon Grundy
 * Doctor Light
 * Gorilla Grodd

Trivia

 * Coming Soon

In Other Media

 * Justice League (Smallville)
 * "Justice League" (TV Series)
 * "Justice League Unlimited" (TV Series, sequel series to "Justice League")
 * Batman Beyond (TV Series) as the Justice League Unlimited (JLU)
 * The Batman (TV Series)

Links

 * http://en.dcdatabaseproject.com/Justice_League_of_America_%28New_Earth%29
 * http://www.comicvine.com/justice-league-of-america/65-31815/