This month, the US experienced the 2nd largest banking failure in history. Below are two articles that give a brief history of the world's monetary system and will better help you understand why the world continues to move towards one central banking system or a Central Bank Digital Currency (CBDC).
Is Money Backed By Gold? https://www.gainesvillecoins.com/blog/is-money-backed-by-gold
Gold Standard vs. Fiat System https://www.investopedia.com/ask/answers/09/gold-standard.asp
Letter from Congressman Warren Davidson warning about the attempts of the US government to implement a Central Bank Digital Currency (CBDC).