The Crisis on Infinite Earths crossover of 1986 was designed and written with the purpose of streamlining most of DC's characters into one more-focused continuity and reinventing them for a new era, thus Wonder Woman and Steve Trevor were declared to come from the Earth-Two dimension, and along with all of their exploits, were erased from history, so that a new Wonder Woman character, story and timeline could take priority.
As the soldiers landed on the shore and began to open fire, several archers leaped from the cliffs. Diana watched, horrified, as a bullet fired from one of the German soldiers hit an archer, killing her almost instantly. Amazonian cavalry stormed the beach, engaging the soldiers and quickly overwhelming them. Though Trevor told her to stay back as he fought one of the German soldiers, Diana picked up a sword from a fallen Amazon and easily dispatched a soldier.
Diana attends Clark's funeral in Smallville along with Bruce, with the latter paying for it as an anonymous donor. The two share a conversation about honoring Superman by bringing together the three other metahumans, in case a worse threat to the world should ever arise. Diana inquires why Bruce is proposing it. He replies that it is simply due to a feeling he has that things will imminently get worse (in reality, he was following the instructions given to him by the scarlet time-traveler that appeared in one of his "dreams", as well as heeding Lex Luthor's enigmatic warning). Diana walks away from the graveyard, pondering his words.
^ Mozzocco, J. Caleb. "The Many Loves of Wonder Woman: A Brief History Of The Amazing Amazon's Love Life". ComicsAlliance. Archived from the original on August 30, 2012. Retrieved August 28, 2012. When the next volume of Wonder Woman would start, Trevor was sidelined as Diana's love interest. He still appeared in the series, but as an older man, one who would ultimately marry the post-Crisis version of Wondy's Golden Age sidekick, Etta Candy.
Perhaps due to her Amazonian background, Diana greatly respects other noble selfless warriors, as evidenced when she attended Superman's funeral in Smallville and spoke of how he had been much more than a soldier (adding to what Batman said about Metropolis burying an empty casket). As a result of her great posthumous respect, she was, therefore, more than willing to aid Batman in honoring the heroic death of Superman, by helping round up the metahumans from Lex Luthor's files to form a team of superheroes (later known as the Justice League) to protect the world from the imminent mysterious alien invader Steppenwolf and his Parademon minions after Superman's death left the world vulnerable.
Still puzzled as to Diana's identity, Bruce discovers more about her amongst the data he stole from Lex Luthor. He sees a photograph of her alongside the Wonder Men, taken in Belgium in 1918 during the closing days of World War I. He then makes contact with her via her laptop, sharing extra information that Luthor had on both her and other metahumans, such as the Flash, Aquaman, and Cyborg. Diana is visibly intrigued and shocked at this revelation, as Flash's lightning reminds her of that of Ares, Aquaman reminds her of depictions of Poseidon, while the Mother Box that created Cyborg reminds her of the one she briefly saw back on Themyscira. Diana resolves to take some time to think this revelation over, does not answer Bruce's e-mail, and instead proceeds with her plans to depart Metropolis on a flight back to France, through Turkey.
The modern age of the character can be tied to the reboot of the character following Crisis on Infinite Earths. In this the character became defined by the vision of George Perez in a way which the entire concept of the character was defined by his direction. As opposed to the past where the character would get retold origins which would try to make her more contemporary, now she got one which tied her much more strongly to the stories of the ancient gods. For the first time Diana enters Man’s World not knowing how to speak English already, and is forced to master the language on her own. In this period she also became much more closely related with modern female issues, and this was usually through her circle of friends – Julia and Vanessa Kapatelis and Mindi Mayer. Such issues as the cultural need for women to be attractive and thin, suicide and the sensationalization of the media as it pertains to women were all addressed. This version of the character also reimagined Steve Trevor as a father figure for Diana as opposed to a romantic counterpart. After Perez’s run on the character, she was taken over for a time by William Messner Loebs, who recast her again in somewhat more traditional superhero stories, though in this case she still explored a different aspect of humanity. After a long space voyage, when she returned home she was forced to work at a fast food restaurant to pay her bills and made friends with a number of people in her “civilian identity.” This built up to the revelation of betrayal of her mother, and of Artemis taking over as Wonder Woman for a short time, but this was soon reversed. The following writer was John Byrne, who when he was writing Superman in the post-Crisis on Infinite Earths DC universe, had hinted at a relationship between Diana and Superman. This was explored occasionally under his run, but it is probably best known for the death of Diana, and the assumption of her duties by Hippolyta. She was soon returned to life (as she had never really died, instead having been deified). This period also introduced Cassandra Sandsmark, who would go on to become Wonder Girl at a later point. The remainder of this second series is best remembered for by the writing of Jimenez and Rucka, both of whom helped define the character. The latter during the lead-in of events to Infinite Crisis had Diana fighting Superman who was being controlled by Maxwell Lord. Battered after their battle, Diana has managed to stop Superman by using her lasso of truth on Lord, and the only option which she is given to stopping him is to kill him, and realizing this is the case, she does so. This created a controversy both within comics and in the real world, as both fans and characters alike debated the morality of this decision. In comics this also led to strained relations between her and Superman and her and Batman and with the addition of the events of Identity Crisis, helped to lead to the breakup of the Justice League of America at a crucial point right before the main events of Infinite Crisis were about to begin.
In one episode, a newspaper editor named Brown, desperate to discover Wonder Woman’s past, assigns a team of reporters to chase her down; she easily escapes them. Brown, gone half mad, is committed to a hospital. Wonder Woman disguises herself as a nurse and brings him a scroll. “This parchment seems to be the history of that girl you call ‘Wonder Woman’!” she tells him. “A strange, veiled woman left it with me.” Brown leaps out of bed and races back to the city desk, where he cries out, parchment in hand, “Stop the presses! I’ve got the history of Wonder Woman!” But Wonder Woman’s secret history isn’t written on parchment. Instead, it lies buried in boxes and cabinets and drawers, in thousands of documents, housed in libraries, archives and collections spread all over the United States, including the private papers of creator Marston—papers that, before I saw them, had never before been seen by anyone outside of Marston’s family.
Straczynski's run focused on an alternate timeline created by the Gods where Paradise Island was destroyed leading to many Amazons being raised in the outside world. It revolves around Wonder Woman's attempts to restore the normal timeline despite the fact that she does not remember it properly. Wonder Woman in this alternative timeline has been raised in New York City as an orphan and is coming into her powers. She is aware of the presence of Amazons, but does not remember her childhood on Paradise Island. Wonder Woman wore a new costume designed by DC Comics co-publisher Jim Lee. Writer Phil Hester continued the storyline.