Neo-Mesopotamia

Once, many countries were destroyed by the Gremlin disaster.

Greece, Australia, Canada, and so on.

Most were destroyed by monsters.

Australia is still a monster paradise and does not allow humanity to resettle.

Some countries rebuilt after collapsing.

Egypt, Spain, China, and so on.

China in particular was stripped of every living thing by the Class 1 monster Taotie, yet the people who had scattered throughout the surrounding regions returned, and the country is now in the midst of a spectacular revival and great leap forward.

Some countries did not perish.

The United States was once ravaged by the Demon King and forced to establish a government-in-exile in Cuba, but its president survived and successfully reclaimed the homeland.

Japan's territory was split apart, but with Tokyo at its center, it reunified the Japanese Archipelago and restored the national polity...