Exactly.

The reason, from my understanding, is that taxes on products can vary from region to region, so it's impractical to expect the store to have the price listed with the sales tax included, especially on advertisements. The sales tax in my state can vary by 1% or so between cities/counties, and advertisements are frequently at the state level, if not national level. My next door city has a 0.10% lower sales tax rate vs my city, and the resort area in the county has 1.5% higher sales tax than the rest of the county.

Food is taxed at a different rate, and the tax is split about 50/50 between state and local. Our state has been discussing ending the tax on food, but that would only end the state portion (1.75%), so the local tax (1.25% pretty much everywhere) would remain.

AFAIK, Europe includes it because it's imposed at the government level (I think EU?), not the local level.

I still think it's dumb, and it should at least be on the price stickers in the store so I can have a chance at estimating the final bill before I get to the register.