FALLOUT: Flag of the U.S. Annexed Canada

"The foundation for Canada's annexation was laid in 2059, with the establishment of the Anchorage Front Line as America's bulwark against the Chinese. National relations with Canada and the United States deteriorated rapidly with continual pressure from the U.S to Canada for authorization to be given for the US Army to protect (and by unofficial extension, claim) the Alaskan oil pipeline hosted on Canadian land. Permission was eventually granted in 2067, after the Chinese invaded a year later."

Flag of the Brotherhood of Steel
Flag of the United States of America
Flag of the New California Republic
Flag of the Enclave
Flag of the Texas Brotherhood
Flag of the European Commonwealth
Vault-Tec Commercial Flag
Vault 111
Flag of the Followers of the Apocalypse
Flag of the Brotherhood Outcasts

Flag of the Texas Commonwealth
Flag of the Four States Commonwealth
Flag of the Northwest Commonwealth
Flag of the Gulf Commonwealth
Flag of the East Central Commonwealth
Flag of the Plains Commonwealth
Flag of the New England Commonwealth
Flag of the Columbia Commonwealth
Flag of the Northern Commonwealth
Flag of the Southeast Commonwealth
Flag of the Southwest Commonwealth
Flag of the Great Midwest Commonwealth
Flag of the Eastern Commonwealth

Flag of the U.S. Annexed Canada
Map of Pre-War America