US War Plan Red covered possible conflict with Britain (Red and hues
thereof for
other parts of the empire: Scarlet, Ruby, etc). US Army planners argued that
Britain might intervene in a US-Japan (Blue-Orange) conflict because USN plans
to blockade Japan would inevitably cause losses to neutral shipping. The Army
hoped for a 4.6 million-man army to subdue Canada. The USN predicted Canada
would simply declare neutrality. The USN gave it lip service as War Plan
Red-Orange until 1930, then effectively ignored it. War Plan Red was cancelled
in 1939.

For Canada’s current (1998!) preparations to invade the USA, such the build up
of a huge
guerrilla army all along the northern border, see
http://www.neptunenet.com/antican/.

> > I seem to
> >recall reading, years ago, that as late as 1915, both British and American
> >naval dons were still working diligently on war plans aimed at
likelihood of
> >fighting one another!
>
> Uh … this planning was extremely hectic on both sides of the Great Puddle
> in ’19, ’20, and ’21. For a while, it looked like a UK-Japanese-Italian
> alliance would be scarfing it up with a US-French alliance, a development
> subvented by the Washington Naval Treaty of 1922. See the first volume of
> Roskill’s NAVAL POLICY BETWEEN THE WARS for details.