Read up on how the US treated Canadian draft dodgers during the WW2 period. America was determined to stay out of that war initially, and some Canadians came here in order to avoid conscription. Canada repaid the US for our passive hostility to that war, and stuck it to us with their very own version of draft dodger succor during the Viet Nam fiasco.
I am quite tired right now, but a thorough search might help you to be self informed.
Good luck!
Multiple tours in Vietnam left me about as informed as I care to be about that war.
Good night, tired one.