tl;dr a just-in-case plan by the US Armed Forces to invade Canada as part of a war against Great Britain, see http://en.wikipedia.org/wiki/War_Plan_Red http://e

tl;dr a just-in-case plan by the US Armed Forces to invade Canada as part of a war against Great Britain, see http://en.wikipedia.org/wiki/War_Plan_Red http://en.wikipedia.org/wiki/War_Plan_Red