Either eliminate sales taxes and replace them with something else or have citizens pay them no matter where (in the USA) they make the purchase and whether the delivery involves a face-to-face pick-up or a delivery made via interstate commerce.
That inches toward a Value Added Tax (VAT) which most European countries use instead of sales tax. The VAT has been debated in this country for many years and has never gained any traction.
Part of the problem, despite the greater efficiency of a VAT, is that it bypasses the states and localities, many of which rely on sales taxes as a significant source of income.
Another part, often ignored, is that VAT is subject to fraud, just like sales taxes are.
I apologize for this digression, but I'm afraid the thread is drifting toward politics and policy and losing its connection to FIRE and Money.