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In this post-apocalyptic future, the "known world" seems restricted to North America.
See also Are there other governments in The Hunger Games world?, a question on another SE site. Throughout the Hunger Games series, there is never any mention of societies or even geographic locations outside of North America. It seems that whatever disaster ...
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Not textual evidence, but authorial intent seems relevant here.
In an interview, Collins said this:
But given all that, you still need to leave room for Snow's personality. Is he a product of nature or nurture? Everyone of his generation experienced trauma, loss, and deprivation. And yet Sejanus, Tigris, Lucy Gray, and Lysistrata turned out very differently....
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