I know a plan is simply good policy, even still our contingency for war with Britain drawn in the 20s is extremely interesting.
I'd rec reading the article and not my snips, but the snips are better than nothing
http://en.wikipedia.org/wiki/War_Plan_Red
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Occupying Halifax, following a poison gas first strike, would deny the British a major naval base and cut links between Britain and Canada.
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"The best practicable route to Vancouver is via Route 99"
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American war planners had no thoughts of returning captured British territory.
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Royal Navy officers generally believed that if war did occur, they could transport an army to Canada if asked, but nonetheless saw it as impossible to defend against the much larger United States, so did not plan to do so, as Canada's loss would not be fatal to Britain.
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Realpolitik at its' horrific best.
Pete