I believe the case against classical liberal economics has more to do with the economic crises of the late 19th century and specially the Great Depression than with the wars.
That'd be equivalent to grow America's M2 ($20 trillion) by 12 trillion in just 4 years. 2019 to 2022 wasn't even that intense and, well, we can see how ugly things have gotten.
I’m not an economist so I’m speaking from a position of ignorance here. But I thought the US was on gold standard during this time period.
How was the Fed able to increase money supply by such a large % without e.g. the country mining a lot more gold?
I tried a cursory search but was unable to find any answers.
The only way to stop politicians meddling with money is to denationalize it and eliminate legal tender laws.