"What if Captain America" is an incomplete question, and it is unclear what the question is asking. However, based on the search results, it seems that the question may be related to the Marvel Cinematic Universe (MCU) and the "What If...?" animated series. The first episode of the series, titled "What If... Captain Carter Were the First Avenger?", explores what would happen if Peggy Carter took the Super Soldier Serum instead of Steve Rogers and became the superhero "Captain Carter". The series features alternate storylines of the MCU films, creating a multiverse of infinite possibilities where a single choice can branch out and create alternate worlds from the ones we know.

Additionally, there is a Marvel comic book titled "What If Steve Rogers Had Refused to Give Up Being Captain America?" that explores an alternate storyline where Steve Rogers did not give up being Captain America.

In summary, the question "what if Captain America" is too broad and incomplete to provide a specific answer. However, based on the search results, it seems that the question may be related to alternate storylines of the MCU films and the "What If...?" animated series and comic book.