Pay cash and nobody can track you.
Sure they can if you take a smartphone everywhere or own property etc.
With all the security cameras and facial recognition, they sure can. It's just a little harder than if you pay by credit/debit card. That paper receipt they gave you at the register has a time stamp they can correlate with the security video.
They already know more about you than you do.
Depends on how you obtained the cash. If you sold your used car to somebody and neither of you ever reported that transaction, true. If you got it by sticking a debit card in an ATM or grocery terminal, false. In fact the IRS is interested.
I'm sure you noticed that globalists don't want anybody to use cash. So in the future, if govt declares cash illegal, you would have to trade your used car for something else, unless there is an underground cash economy.
All US bills are serialized.
These days it wouldn’t be tough to track much of each bills travels.