In 2204 AD, a mutated virus broke out in Washington, USA.
In 2237 AD, the mutated vaccine was produced in the United Kingdom, and the American mutated virus gradually spread to the entire North American continent.
In 2289 AD, one-third of the cities in the United States were quarantined and the number of vaccines was seriously insufficient.
In 2294 AD, the mutated virus spread to the ocean and spread to Europe.
In 2308 AD, the United States was isolated by the United Nations, and North America was gradually destroyed.
In 2335 AD, all countries in the world were forced to sign a treaty to unite into one, and all countries in the world formed the United States and formed partitions. North America was quarantined, and South America developed an enhanced cell virus.
In 2340 AD, the enhanced cell virus spread throughout the United States except North America. After a unanimous decision, most of it was confiscated from all over the world, and a small amount was sold illegally and privately on the black market in various places.
It is now 2370 AD, and our story begins here.
In a world that is nearing the end of the world, you are my only light -DAWN