This is my opinion and I, in no way, consider myself a doctor. This virus may spread even further in the US, and probably will. However, we have had no deaths (yet). I truly believe our vaccinated society, even though we may not have a vaccine for this particular one yet, will overcome the threat due to our people having better immune systems.
Civilizations like the Aztecs and Mayans possibly succumbed to diseases from the Spanish Conquistadors who conquered them and contaminated them with their germs. The Spanish had better immune systems and the Mayans had not been exposed to these germs before so they died off.