So far there have been about 218,000 American deaths. There is no scientific basis for your 1,148,700 number. The only way we could have prevented all of the American deaths would have been by completely sealing our borders back in December, but at the time no one realized how serious it was. We now know there was already widespread community transmission by January and at that point a high death toll became inevitable.
https://www.wsj.com/graphics/when-did-covid-hit-earliest-dea...