| http://www.w3.org/ns/prov#value | - Two major oil crises struck the U.S. economy in the 1970s -- first in 1973, as shortages caused blackouts and rapid increases in prices for fuel and other commodities; and then in the late 1970s, during Carter's presidency, as major oil exporters reacted to the Iran hostage crisis again to cause gas lines and supply shortages.
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