It was. Then George W, Obama, Trump and Biden ran the debt beyond petrodollars.
So in my limited economic background, it has been said that the entire US monetary system is based off debt. Whether it is futures contracts, mortgage backed securities, loans to banks and corporation. Everything is owed and few citizens own anything. Most use leverage to gain access to prosperity.
The Petro dollar is a weak position if you dont control most of the oil. The USA does not control most of the oil. After closing Keystone, they were no longer the world's leaders in exporting oil. Saudi Arabia is hooking up with Iran and China.
So both of these key facts among the war machine draining the american citizens of every cent is adding up to a doomsday dollar scenario.
They have 300 million people. China has 1.5 billion. India the same.
American citizens foolishly believe they are still a military power. The factories that make the computer chips are in Asia. The steel is Chinese.
America is done. Still dangerous but bleeding to death.