Oil prices, notoriously vulnerable to political events, spiked as high as $40 a barrel during the Gulf War in 1991.
Oil prices will be affected by US elections.
( z1 affect :ARG0 ( z2 elect :location ( z3 country :name ( z4 name :op "US" ) ) ) :ARG1 ( z5 thing :ARG2-of ( z6 price :ARG1 ( z7 oil ) ) ) )