They also have no land borders. Very easy to close borders when all it involves is closing airports and turning ships away. That's doubly true when you have no exports that are vital to the world economy.
Also, a country of the size of New Zealand is easier to control like a speed boat vs. US like a huge tanker. Ofcourse, if you put an authoritarian boosters on the tanker (China), its possible.
Just to put things in perspective, New Zealand's population is half of Silicon Valley / SF Bay Area.
Just to put things in perspective, New Zealand's population is half of Silicon Valley / SF Bay Area.