Wars must be funded, and for this governments functioning as states call upon the banking system for assistance.

Central Bank counterfeiting, which is another name for inflation, is the fuel that energizes the forces of war.  Inflation, or counterfeiting, amounts to issuing receipts for something that doesn't exist, which legally is the prerogative of the central bank.  Calling such receipts money allows them to be created in massive amounts quickly.  When the US Congress votes to send billions of fiat money to Ukraine, Israel or anywhere else, no one questions the nature of what is being sent because legal tender laws make it all copasetic.

Yet, we should know better.

As to the assumed authority of any assembly in making paper money, or paper of any kind, a legal tender, or in other language, a compulsive payment [Thomas Paine wrote in 1786], it is a most presumptuous attempt at arbitrary power. There can be no such power in a republican government: the people have no freedom, and property no security where this practice can be acted . . .

If anything had, or could have, a value equal to gold and silver, it would require no tender law: and if it had not that value it ought not to have such a law; and, therefore, all tender laws are tyrannical and unjust, and calculated to support fraud and oppression. [emphasis added]

Banks belonging to the Federal Reserve central banking cartel can issue credit based on the Federal Reserve Board's Regulation D, which specifies "a set of uniform reserve requirements for all depository institutions with transaction accounts," so that, for instance, if the reserve ratio is 1:10, a bank with $10 million in reserve can issue $100 million in credit.  Could you loan $100 to a friend if you only had $10 to spare?

The Fed dropped the reserve ratio to near zero in March, 2020 during the Covid pandemic.  I'm tempted to say the Fed would react in a similar manner to a Congressional declaration of war, as required by the Constitution, but the war power of Congress has been neglected since WW II.

We need to keep in mind that lending as such is crucial to our well-being.  As one commentator astutely observed, without an international banking system most of us wouldn't be alive today. Money and banking make possible the division of labor, which has drastically reduced child mortality and raised living standards wherever free markets flourished.