Say it with me- low population density and avoiding close interactions. Those two make it hard to transmit.
We've been over this - there may be some correlation between population density and COVID cases, but only a little. In New Zealand's case, they brought in tough restrictions right from the get-go and they are on isolated islands, which helps control their borders.
Population Density -
COVID-19 Cases (Total) -
As Percentage of Population
New Zealand - 19 people/km^2 - 2,100 - 0.04%
Canada - 4 - 485,000 - 1.3
Russia - 9 - 2.7 million - 1.8
China - 146 - 94,500 - 0.007
USA - 34 - 16.7 million - 5.0
India - 411 - 9.9 million - 0.7
S. Korea - 516 - 45,400 - 0.09
I'm not seeing a pattern between population density and case numbers. I don't know how reliable China's or India's numbers are - China, because of their penchant for secrecy and India, because of health services infrastructure. Regardless, if they had numbers anywhere close to those of the US, as a percentage of population, there would be no way to cover them up.
The keys to keeping case numbers down:
- Strong, smart health measures, right from the start
- Strict border controls
- Public buy-in