
Brief background to why they're fighting:
Captain America: Civil War PlotCaptain America: Civil War plot picks up where Avengers: Age of Ultron left off, as Steve Rogers leads the new team of Avengers in their continued efforts to safeguard humanity. After another international incident involving the Avengers results in collateral damage, political pressure mounts to install a system of accountability and a governing body to determine when to enlist the services of the team. The new status quo fractures the Avengers while they try to protect the world from a new and nefarious villain.
Basically after another Avengers outing, a whole bunch of innocent people die, tons of backlash, governments put pressure on SHIELD to pass a "Superhero Act" forcing all heroes to register their real identities and information to the public and forces them to become employees of the government, not an independent apolitical super hero group as they once were. Tony Starks is on board, but Cap is like "PHUCK THIS", we need our freedom and privacy yo. They form opposing teams and voila, battle royale.
On one team you have Captain America, Falcon and his smart drone Red Wing, Winter Soldier/Bucky, Hawkeye, Antman, Sharon Carter, and Scarlet Witch(not pictured).
On the other side Iron Man, War Machine, Vision, Black Panther, Black Widow, and Spiderman(not pictured).
We won't count Hulk or Red Hulk/General Thunderbolt Ross, because they haven't been confirmed yet or don't have allegiances yet. Thor's off to Asgard to fend off the Norse end of days, Ragnarok, so he's not in this conflict.
So who you side with? Cap or Tony Starks? Pro-Registration or Anti?