how will the coronavirus impact the U.S. if it spreads across all states?

The worst case
Everybody gets it

The death rate is about 8% so our population is reduced a bit.
 Your guess as to what happens then is as good (or better) then mine

I heard that mortality rate estimates range between 0.5% and about 4%, so 8% seems a bit high. However, it varies by age, as you can see here: https://www.worldometers.info/coronavirus/coronavirus-age-sex-demographics/

As you can see from the data at the above link, it's very dangerous to older people, with a mortality rate of above 14% for 80+yr olds.

Keep in mind that depending on the number of people that are asymptomatic (ie don't have symptoms) the real mortality rate may be lower.

I expect widespread disruption for the next approx 12-24 months, while it makes its way around, until a vaccine becomes widely available (or until the vast majority of people have had it).

the mortality rate depends on the age, fotr less than 40-50years old it  is  <0.5% and goes up to about 18 % for more than 80 years old
look here :  https://www.worldometers.info/coronavirus/coronavirus-age-sex-demographics/

I think corona virus is not more dangerous than other common flu with cough, fever, headache and is now more an hysteria given by social networks and internet  - not that I mad specialist, but many doctors say so, proved by the fact that children up to 9 have not been affected and only older people over 60 with other diseases had hard times down to death.
Why no one says how many people die due to normal flu or other deases, if you want contagious? Because a forced vaccine will bring a lot of profit.

i heard factories in China are already starting up again; so it may not get much worse after all

Thank you very much, everyone, for your well-thought-out replies to my question.  To be perfectly honest, I found myself reading and rereading many of your in-depth insights shared here.

 I do not know how true this is, but, I remember reading somewhere that this virus could possibly be man-made.  Given the advancements in science and technology in conjunction with gross deviancy, I certainly would not rule this out.

George

be assured - George, trump knows all about it : the  Europeans are to blame ( not even the chinese)
evn after his denial of the virus being a problem before…..

Thanks ..............and a major fiscal package will be announced in the next couple days if not today.

Sadly I don't hear of any stimulus that would help retired people.
Australia is sending every adult a check for $1100.

Belgium is going into a lockdown too for 3 weeks -

Australia is sending every adult a check for $1100.  Which with the current price gouging going on this may get you 1 roll of TP on Amazon or 3 refurbished rolls (slightly stained) of TP on Ebay. WASH YOUR HANDS and use SOAP

what is  a roll of TP ?

TP == Toilet Paper

The US has lagged behind other countries. S. Korea has it contained by giving 10,000 test a day. Based on proportional populations and hearing the administration speak of 1 million test kits that is a joke. We need 50+ million test kits.
Every person needs to be tested because 1000's are out there with the virus but no symptoms but still able to transmit it to others.

You get better information from the state departments of health than via Mike Pence and the CDC that has to ok everything from the VP. This has been politicalized by the POTUS 

the virus throws all stes back on their own - like in the mediëval Ages; all borders closed, no traffic