Actually the hardest to legally immigrate to. It is not that difficult to get across the border (and you can properly walk across the Canadian undetected).
Which is a real shame, you have the option of a real boost in the economy if you those who want to work get into the country.
Yes, I'm British and I would love to be able to easily immigrate to the US. I know so many others who would as well - but it requires you to find a US company willing to sponsor you etc which makes it a real hassle