More to the point, Canada does not seem to care who uses their country to enter ours- at least until recently .
This has been a serious problem going back to the Cold War years when Soviet Agents used the Canadian Border to enter the U.S. undetected .
Canada does not border any other country, landwise, except the US ~ ~ ~ ~ so those who enter Canada from anywhere else have the Canadian 'openess' to enter Canada by Air or Sea travel .
Anyone from any Third World Country can get a tourist visa to enter Canada - - then scurry on down to ours . . .
30,000 people emigrate from Canada to America per year-
obviously many of them are not native Canadians .
And this is just the 'legal immigration' .