Endgame Writers reveal the existence of two Captain Americas in the MCU since 1945

Spurred by then the Tony Starks’ ( Robert Downey Jr.) sacrifice, the Avengers Endgame showed Captain Americas’ reunion with Peggy Carter, his long last love. In the Screenplay of the Endgame, a title card revealed the exact year Steve Rogers met Peggy. To place the six Infinity stones in their rightful locations after the Thanos death, we have seen Captain America using the help of time travel technology for it. Steve, as a result, utilized the opportunity to return to his previous love after his sacrifice against Redskull in 1945. The sacrifice left him in ice for 60 years.

The original Screenplay confirms the time Steve met Peggy.

In the Climax of the Avengers Endgame, Steve Rogers(Chris Evans) returns to present as a 112-year-old. He gives the star-spangled shield to the Falcon, Sam Wilson-the right-hand man of Captain America. A title card: Washington DC, 1949, accompanies a transition to Columbia Heights, DC.
In the same year, Ms.Carter ended her relations with the Strategic Scientific Reserve. S.H.I.E.L.D expands as the Strategic Homeland, Intervention, Enforcement, and Logistics Division then takes it’s formed from the Strategic Scientific Reserve. Carter, with the S.H.I.E.L.Ds formation, would act as its Director. Peggy Carter(Hayley Atwell) can be seen dancing with Steve Rogers at the movie’s end

Moreover, in the view of the Endgame Screenplay Writers McFeely and Markus, since 1945, two Steve Rogers lived in the MCU.

Christopher Markus and Stephen McFeely’s final pages conclusion

According to both the Writers, there have always been dual Caps present in the Marvel Universe. And the loop depicts no one knew about the other Steve’s existence. For instance, the Doctor strange movie’s character words can be remembered. The Ancient One said that the removal of an Infinity stone created a branch reality from the particular timeline.

Source: ComicBook