Knight Captain Kerr
Still Mildly Glowing

Canada was annexed by America and the annexation was completed in January 2076. In Fallout 3 there was a letter in a mailbox in Springvale that read as follows:
So what do you think, could there be Vaults in Canada?Dear Safety-Conscious Citizen -
We are writing to inform you that your family was not selected for inclusion in your chosen Vault-Tec facility. Your deposit has been retained, and your application added to a waiting list for your preferred Vault. In the interest of your family's security in the event of a minor nuclear event, please consider relocating to one of these areas, where Vault-Tec facilities are available without a waiting list:
For a full list of Vault-Tec facilities with available accommodations, in exciting locales such as Oklahoma and newly-annexed Canada, contact your local Vault-Tec representative!
Vault-Tec wishes you and your family the best of luck in the uncertain future. Best regards;
Vault-Tec
Public Relations Dept
Washington, DC