since 1971 the USD has been off the gold standard and has been on a de-facto "petrodollar" system, i.e. USD backed by petroleum reservers
petrodollar
By LIBERTYMAXXING
By LIBERTYMAXXING
since 1971 the USD has been off the gold standard and has been on a de-facto "petrodollar" system, i.e. USD backed by petroleum reservers