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Technically it is the FED (which is not a part of the federal government) and there are limitation to what they can do.

https://www.thebalancemoney.com/is-the-federal-reserve-printing-money-3305842

What I meant to say is that governments can get the trillions they need when they want without resorting to taxation. They have proven this again and again. Taxation under fiat money is merely another form of control and oppression.