Directors Joe and Anthony Russo have debunked Avengers: Endgame theory that was seemingly
confirmed by the film’s own writers previously. The point of contention
is whether or not Steve Rogers created an alternate reality when he
travelled back in time to restore the Infinity Stones. In Avengers: Endgame, the superheroes attempt to reverse the effects of the villainous Thanos’ snap, which they do by collecting all the Infinity Stones by travelling to pivotal moments from the past.
At the end of the film, Steve Rogers offers to go back into the past to restore the stones. In doing so, he lives out a happy life with Peggy Carter, returning to the main timeline only as an adult.
