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In page The Fall of the Mutants:
"Marvel Comics used a novel approach in advertising the crossover event. A major element within the stories at the time was the public's growing concern over the "mutant menace" and Senator Robert Kelly's proposed Mutant Registration Act, which foreshadowed the dystopian future shown in "Days of Future Past". Marvel distributed postcard-size mock advertisements supporting the act in comic book stores as well as their various titles cover dated "November 1987". Asking "Do You Know What Your Children Are?", the card further suggested that anyone who knew themselves to be a mutant should fill out the form on the back and mail it in to register themselves with the government.
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