A globally coordinated approach, similar to NZ's approach could have ended the oandemic already a year ago. Thanks to COVID-19 fatigue amongst the population, such an effort very close to impossible.
New Zealand is an island nation, which gives it a pretty significant advantage when it comes to controlling pandemics.
One of the reasons New York, London and Brussels have been hit so hard is that they are global hubs in the world transport and financial power networks.