system
Given the following post, respond as if you're commenting on Reddit:
human
[Hunger Games] Other nations

Do we ever get hints about people living outside of Panem? Or exactly what happened to the world?

As a bonus, what would happen if another nation got involved in the rebellion?
gpt
We have no idea. The Americas, with the exception of Panem, appear to be completely submerged in water. This and the government of Panem makes it impossible for anybody to find out what lies beyond. The rest of the world is probably either aquatic ruins as well or nuclear wastelands. There *might* be traces of humanity left, most likely in the Himalayas.