''Ultimatum'' is a novel by Richard Rohmer, a Canadian author who has extensive experience in the energy sector and applied that knowledge to his books of the 1970s and 1980s.

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!!This book contains examples of:
* {{Eagleland}}: Flavor Two, and fairly typical of his books throughout the 1970s. [[spoiler:In this book, the USA is the BigBad threatening to invade Canada in order to get unrestricted access to oil and natural gas.]]
* IndyPloy: Canadians are full of these as they stymie the [[spoiler:would-be United States occupation forces.]] Also might be considered shades of XanatosSpeedChess.