Captain America and Iron Man’s Captain America: Civil War ending is quietly explained by Natasha Romanoff’s decision at the end of Black Widow.
The introduction of the Sokovia Accords into the Marvel Cinematic Universe is the central concept of Captain America: Civil War. It’s the MCU’s version of the Superhero Registration Act from the comics, and it’s been mandated by the United Nations to regulate the activities of all “enhanced” individuals. Captain America refuses to sign it because he believes it is critical for the Avengers to maintain their independence. Iron Man, on the other hand, is all for it, stating that without oversight, Earth’s Mightiest Heroes could become no better than the bad guys. The remaining Avengers are forced to choose sides in their fight, resulting in the titular civil war.
Iron-Man Receives A Package From Captain America
Things grow significantly more personal at the end of the film when Tony realises that Steve purposefully lied about Bucky Barnes murdering his parents. Because the heroes were unable to reach a compromise, the Avengers were temporarily disbanded. For two years, the team was apart until Thanos appeared and drove several groups of heroes back into action in Avengers: Infinity War. Tony gets a package from Steve before that, which includes an apologetic letter and a burner phone for emergency communication.
It’s Possible That Black Widow Was Behind It
It was surprising that Cap took the time to reach out in the way that he did, given their horrific confrontation in Siberia. Natasha, on the other hand, decides to return to the United States to reunite her “other family” rather than help Yelena Belova in rescuing the other Black Widows, as revealed in Black Widow. It’s not out of the realm of possibilities that Black Widow herself persuaded Steve to convey the message to his old foe.
Nat’s knowledge of Bucky’s role in the Starks’ deaths is unknown, although considering her work with SHIELD and proximity to Steve, it’s conceivable she learned about it at some point. In any case, she’d spent enough time with Tony to know he’d never initiate anything.
She may have also felt guilty for abandoning Tony so soon after Rhodey’s tragedy. As a result, she attempted to resolve her personal feelings, as well as the entire situation, by persuading Captain America to take the next step toward reconciliation. While Nat was usually stoic and unconcerned, it’s reasonable to assume that the Avengers’ breakup in Captain America: Civil War had a significant impact on her. Her experience in the Black Widow stand-alone film further fueled her desire to get the Avengers back together—even if she wasn’t directly responsible for reuniting Captain America and Iron Man.