It's no understatement to say that Marvel Comics' Civil War event set the pattern for every subsequent summer event — and one detail inspired the MCU's entire storytelling approach. Comic book publishers always like to claim their latest event will "change the universe forever." In truth, precious few events really fulfil that promise, but 2006's Civil War stands as one of the exceptions.
The plot saw the entire superhero community divide over the Super-Human Registration Act. The pro-registration side was led by Iron Man, and its opponents by Captain America. The main story, written by Mark Millar and featuring art by Steve McNiven, attempted to strike a careful balance between the two sides. Writers of tie-ins were less cautious, however, and most seemed to side with Captain America, with some portraying Tony Stark as an outright fascist. The scale of the superhero Civil War — which affected every comic set in the United States, and drew in international heroes such as Black Panther and the Sub-Mariner — was absolutely breathtaking, and it meant there were more tie-ins for this event than any before.
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Civil War undeniably transformed the Marvel Universe, establishing an unstable new status quo that would continue to evolve over the next few years, culminating in Norman Osborn's Dark Reign and the Siege event that brought down Asgard. Although Civil War was not the first of Marvel's summer events, it set the pattern for all that were to come, setting up the pattern of a main book in which the key events took place. What's more, with the benefit of hindsight, Civil War also set up the pattern that would be followed by the MCU itself.
Looking back,
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