Hahahahahahaha.... oh man, that made me laugh.
US taxes go to make politicians fat, go to other countries, help fuel the American war machine... rarely ever roads, especially if you've seen any of them.
Show me a country where there is no tax; and you can keep laughing
There are very few countries without taxes, I didn't think that was what was being discussed though. US federal taxes as a whole do not go back to the general welfare of the citizens. Some county and state taxes may, but largely not, and it's still up to the local and state governments to properly use the funds, which few do.
I was laughing because the reality is, a fraction of a percent of taxes goes back to general welfare of society.