>>>But make sure it is done legally and the backgrounds of the people who enter are checked. Just like it is done if you immigrate to the USA from any other country.
>
>The other option is to position a large dangerous ocean around yourself with nothing within reach except awful desert continents full of poisonous creatures, and then fine airline companies who allow people onto planes without a permit. ;-) Even so, there will still be a few illegals. ;-)

I can't imagine what countries you mean ;-)