We COULD be an exporter of oil, but our high tech manufacturing needs raw material we don't have enough of. For example cobalt and vanadium for alloying steel. Cobalt is also a critical metal for making lithium batteries, and most of the world's supply comes from Africa. Rare earth elements like ytterbium for semiconductors. And that's the tip of the tip of the iceberg. To pay for these we need stable markets in which to sell our produce and manufactured goods.
Pax Romana made for stable markets, more or less free from piracy, throughout the Mediterranean. Then the followers of the Pedophile Prophet over-ran Egypt, and the supply of papyrus to the western regions was cut off. Suddenly there was no paper for record-keeping and communications, and commerce collapsed. The "Dark Ages" were dark to Renaissance historians because almost nothing was written down. Now imagine America without the raw materials to maintain the Internet. "For want of a nail" isn't just a cute fable.
Silcon wafers usedin chip sets are made from..... wait for it....sand. There is no shortage of sand. Just a shortage of Americ First patriots.