You're claiming "nearly all deaths in the US are counted as covid-19 deaths" and you want ME to cite a source..? Lol
The average number of people who die in the US per day is ~7,500..... So even if by "nearly all" you meant "half", that would mean they are counting roughly 110,000 covid deaths every month. I'm pretty sure that literally nobody is claiming that. And actually based on what I've read, I think it could be argued that they are counting Covid-19 deaths more accurately than they "count" normal flu deaths.. (apparently the CDC flu death counts are at least partially based on estimates and algorithms.. not by actually counting people who died while infected).
But ya my sources are the CDC, Johns Hopkins, worldometers.info, health.com, my phone's calculator, etc..