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The first person to become infected did so by eating a radioactive twinkie.
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The time it took for zombies to take-over United States
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Zombie virus spread within the city of New York till the point when the entire city is made up of zombies
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Infestation spread across the country crossing the Mississippi River on Christmas Day 2020.
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Infection continues across the country rapidly until it reaches the west coast of the United States.
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The zombie take-over of the U.S. is completed on Halloween of 2030. The United States is united as zombies.
