The US has two huge land borders that people regularly commute
and trade across (not to mention cross illegally).
The only success stories with this strategy are Australia and New Zealand, which are island nations completely isolated from anywhere else.
Even single breaches of their 100% quarantine of all arrivals caused outbreaks, and they also closed state borders.
This requirement begins to make sense now there is a vaccine, as within the US the curve should bend down vs the rest of the world, without the vaccine it wouldn't have achieved anything.
The only success stories with this strategy are Australia and New Zealand, which are island nations completely isolated from anywhere else.
Even single breaches of their 100% quarantine of all arrivals caused outbreaks, and they also closed state borders.
This requirement begins to make sense now there is a vaccine, as within the US the curve should bend down vs the rest of the world, without the vaccine it wouldn't have achieved anything.