I Don't Know if the Currency Is Issued by the Government

I didn't understand how we ever got the currency to pay them in the first place. So I sort of accepted it as fact that the government did spend from taxing. But what I couldn't understand was if the currency that we use to pay for, to pay our taxes is the currency that it can only be issued by the government. You don't have to get people to exchange their crowns for the greenback. They just spend the greenback back on things and then you could do the same with your tax payments. It's like a circular logic that I didn't know how to come at it from.