Joe Russo: "We’re using the essence of what Civil War was about. The comic book isn’t applicable to the storytelling that we’ve structured up to this point, but the concept of registration, the notion that heroes need to be either monitored or controlled because their power can be scary, is applicable. The Accords are the world jointly trying to govern the Avengers moving forward. It has to do with the effects of Ultron and Sokovia [the small city that Ultron tried to drop on the Earth from a great height at the end of Age Of Ultron], and New York City [roundly trashed at the end of The Avengers], and Washington D.C. [nearly devastated by falling helicarriers at the end of Captain America: The Winter Soldier]. Examining the third acts of all the Marvel movies, we’re saying, if you could point to the collateral damage in all those incidents, could you use that against the Avengers to control them?"