WOOPS ALMOST FORGOT
If you dont know what civil war is then heres the jist of it:
The series centers around a newly enacted Super-human Registration Act, which, when passed into law, would require all persons in the United States with superhuman abilities who wish to use those abilities to fight crime to register with the federal government and receive proper training as law enforcement officials. Such persons would not only be subject to U.S. law (including the prohibition of minors from participating in such activities), but would, according to the law, reap the full benefits of civil servants, including pensions, and so forth. Because the forced registration of persons would spark a civil liberties controversy, the Act splits notable superheroes within the Marvel Universe, resulting in two super-powered factions forming, one advocating registration as the responsible obligation of the super-powered living in society, and the other opposed to the law on the grounds that it violates civil rights and that it would turn all superhumans into agents of the government. This conflict builds into the titular Civil War, into which themes from current events will be woven.

That was long

and the next part: WARNING PLOT SPOILER
The story opens with a reckless fight between the New Warriors, filming a reality television show, and a cadre of villains in Stamford, Connecticut. The battle goes awry for the heroes, resulting in villain Nitro creating an explosion that destroys a local school and the surrounding neighborhood, and kills all but one of the Warriors. This event catalyzes a government movement to register all super-powered beings as living weapons of mass destruction. The event also turns public opinion against superheroes, as many of them are blamed for the incident. Due to this, many superheroes -- most notably Johnny Storm, the Human Torch -- are attacked in public by angry civilians. Meanwhile, S.H.I.E.L.D. tries to recruit Captain America to become part of the team that will force superheroes to register. Cap refuses, and after being attacked by S.H.I.E.L.D. agents for non-compliance, goes underground to become the figurehead of the anti-registration movement. Iron Man, on the other hand, supports the act and tells the government to leave Captain America to him and the other pro-registration heroes.
The act is soon passed, and a day later Captain America and the Falcon, of Captain America's underground resistance, rescue the Young Avengers from a S.H.I.E.L.D. prison convoy. They bring the teen superheroes to a secret facility that Nick Fury has allowed them to use. Meanwhile, Peter Parker, after deliberating with his wife, Mary Jane Watson, and Aunt May, unmasks himself to an audience of the world press, showing his full support for the registration act. This action causes J. Jonah Jameson to faint, as the thorn in his side for so many years was right under his nose. Norman Osborn, in prison, remarks that Peter broke a deal they had. Meanwhile, Wolverine is hunting down Nitro and the Thunderbolts are recruiting villains to the cause of registered superheroes.
