system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Is there any canonical information about vaults or other shelters in other countries outside of the US?

Of course the Vaults were made by Vault-Tech, a shadow group which was also the Enclave and responsible for the apocalypse, but that does not mean they did or did not have any facilities in other nations.  And even if they did not, is there any canonical information about shelters in other countries?  We know there are some survivors in Europe and China and elsewhere, but do we know of any actual long-term underground survival shelters?
gpt
No. Vault-Tec was a part of a US Operation, and all of the powers of Vault-Tec were put into creating Vaults in the US.

...although the US did annex Canada...so maybe a Vault or two is in modern day Canada. Although that would still be the US in the Fallout Universe.

Edit: The US also invaded Mexico, but it is unknown if Mexico was even annexed. So Mexico could still be...Mexico.