The overall greater space, clean air and general cleanliness of the USA (compared to China or Hong Kong) will help restrict its spread here as well.
You can also greatly decrease your own odds of getting CoVad-19 (or any virus) by simply washing your hands very regularly, NOT touching your face or head, keeping space between you and others in public areas, and wiping-down/sterilizing things like door handles, light switches, computer keypads, etc…that you touch regularly.
For an older person somewhat set in their ways, that is VERY hard to not do.
It's inhuman!
(Harry Mudd)