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The 2004 Backlash was the sixth Backlash professional wrestling pay-per-view (PPV) event produced by World Wrestling Entertainment (WWE). It was held exclusively for wrestlers from the promotion's Raw brand division. The event took place on April 18, 2004, at Rexall Place in Edmonton, Alberta, Canada, thus being the only Backlash event held outside the continental United States until the 2023 event. The concept of the pay-per-view was based around the backlash from WrestleMania XX.