I just want to remind you that the British asked, not ordered, if I'm not mistaken, Canada to aid them in their war effort. Canada possessed and still possesses great industrial power in, for one, the domain of aluminum production. Aluminum was one of the most needed products during the war, used to construct everything from helmets to tanks to rifle parts. Some of this aluminum was produced in my hometown, after the construction of a dam during WWII in which several people died. Canadians, even if their troops didn't make much of an impact, were always involved in one way or another.
I invite you to look at this link, concerning GERMANS for American independence:
http://www.americanrevolution.org/flohr2.html