In 1991, World Championship Wrestling (WCW), another subsidiary to the NWA, established the WCW World Heavyweight Championship to complement the NWA's world title. WCW then seceded from the NWA and grew to become a rival promotion to the WWF. Both organizations grew into mainstream prominence and were eventually involved in a television ratings war, dubbed the Monday Night Wars. Near the end of the ratings war, WCW began a financial decline, which culminated in March 2001 with the WWF's purchase of WCW. As a result of the purchase, the WWF acquired the video library of WCW, select talent contracts, and championships among other assets. The slew of former WCW talent joining the WWF roster began "The Invasion" which effectively phased out the WCW name. Following this, the WCW Championship was unified with the WWF Championship, at Vengeance 2001 in December. At the event, Chris Jericho defeated The Rock and Stone Cold Steve Austin to win the WCW Championship and WWF Championship respectively. Consequently, Chris Jericho was named the final WCW Champion and the subsequent Undisputed Champion as the WWF Championship became the Undisputed Championship in professional wrestling with no other prominent world heavyweight title to dispute the recognition.
By 2002, the WWF roster had doubled in size due to the overabundance of contracted workers. As a result of the increase, the WWF divided the roster through its two main television programs, Raw and SmackDown!, assigning championships and appointing figureheads to each brand. This expansion became known as the Brand Extension. In May 2002, the WWF was renamed to World Wrestling Entertainment (WWE) and the championship became known as the WWE Undisputed Championship. Following these changes, the WWE Undisputed Championship remained unaffiliated with either brand as competitors from both brands could challenge the WWE Undisputed Champion. Following the appointment of Eric Bischoff and Stephanie McMahon as General Managers of the Raw and SmackDown brands respectively, Stephanie McMahon contracted then-WWE Undisputed Champion, Brock Lesnar, to the SmackDown brand, leaving the Raw brand without a world title. On September 2, after disputing the status of the Undisputed Championship, Eric Bischoff announced the creation of the World Heavyweight Championship, having spun off from the Undisputed title. Immediately afterward, the WWE Undisputed Championship reverted to being the WWE Championship.
- The title was renamed the WWE Undisputed Championship on May 6, 2002 after World Wrestling Federation Entertainment, Inc. settled a lawsuit with the World Wide Fund for Nature, and became simply World Wrestling Entertainment.
- "Undisputed" was removed from the title's name after it became exclusive to the SmackDown! brand on September 2, 2002, which resulted in the creation of the World Heavyweight Championship for the Raw brand. He became the youngest WWE Champion in history. (Brock Lesnar)