In 1991, Marvel revised all the X-Men titles at the time in order to focus on the launch of a second X-Men series simply titled X-Men. This launch would have the return of Xavier and the original team split in two, with Cyclops' team being "Blue Team" and Storm's team being "Gold Team". The new series was written by Claremont and drawn by Jim Lee.
Issue #1 of the new series sold $7 million worth, around 3 million issues of 8.1 million pre-ordered, these numbers were record breaking and Guinness presented the honor to Claremont at the 2010 San Diego Comic Con.
Around this time X-Force was released, but it caused conflicts with the X-Men creative teams. Bob Harras(an editor of X-Men) sided with Jim Lee and Whilce Portacio(an artist for Uncanny X-Men) over Claremont in a dispute over plotting.
Claremont left after 3 issues of X-Men and ending his 16 years of work as an X-Men writer. There would be many replacements for Claremont over the years. Jim Lee would later leave, along with a few other artists in the following months, for Image Comics.
The X-men series had many books and mini series. It still had crossovers that happened annually from 1990-2001(The X-Tinction Agenda, The Muir Island Saga, The X-Cutioner's Song, Fatal Attractions, Phalanx Covenant, Legion Quest, Age of Apocalypse, Onslaught, Operation: Zero Tolerance, Hunt for Xaiver, The Magneto war, Apocalypse: The Twelve/Ages of Apocalypse, and Eve of Destruction), but many fans and editorial staff disliked the crossovers due to them feeling artificial, disruptive to the story, and not being all too impactful, but they were still a financial success.
The 1990s also introduced many new characters such as Gambit, Cable, and Bishop! As well as a bunch of solo series for the many characters!
1998 showed the end of Excalibur and X-Factor, but was replaced by Mutant X which took place in a parallel universe.
