I was very clearly referring to the situation in 1979 when the petrodollar system was formalised, which itself was long after dollars became the standard currency for trading oil.
That base was exclusively a Saudi air force base until the first Gulf War, which occurred long after the dollar became the standard currency for trading oil.
That base was exclusively a Saudi air force base until the first Gulf War, which occurred long after the dollar became the standard currency for trading oil.