Doomsday America.

"No system, no superpowers, no saintly side." The somber version: It takes at least tens of thousands of years to evolve from a beast to a human. But can a human regress into a beast in a year? Let's try it. Thus, a zombie crisis erupted, and order completely collapsed. Civilization departed from us. The dead accompany us. The entertainment version: A zombie crisis erupts in America, a cause for celebration! What? I've transmigrated to America? The zombie crisis has just broken out? Destroy it, I'm doomed. Wait, who draped a flag over my shoulders? You…you…you've really ruined me!