Why did Steve Rogers pass the Captain America mantle to Sam Wilson in 2014?

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Chris Evans as Captain America stands in costume holding his shield, with an American flag and sunlight in the background. — Captain America Chris Evans as the title character in *Captain America: The First Avenger* (2011), directed by Joe Johnston.

In 2014, Steve Rogers passed the mantle of Captain America to Sam Wilson because his body was subjected to rapid aging. This physical transformation occurred due to the diminishing effects of the super soldier serum that had originally granted him his powers. Following this change, Wilson, who had long served as Rogers's ally under the alias Falcon, assumed the role in All-New Captain America no. 1.1