They got all pouty face about it so we quit allowing people at the war college to draw them up.
We have a plan to invade Vatican City and, possibly, the Magic Kingdom but not Canada.
Now if some of the provinces of Canada want to join us they can take steps to do so but admission is not guaranteed.
Alberta and Saskatchewan would be better off as independent countries if the provinces cannot work out a deal with Ottawa for greater sovereignty over energy, agriculture, and other matters. Over 200 years of separate political systems make the Canadian provinces incompatible with the United States.