Saudi Arabia, the biggest oil producer in the world, was once a supporter of Osama bin Laden and his associates who led attacks against the United States.
The United States might be the second biggest oil producer in the world
It doesn't give any information on where the US is on the ranking, only that Saudi Arabia is 1. Therefore, the US could be any other rank. The system got it wrong because it doesn't recognize what "might" means
( z1 possible :ARG1 ( z2 have-degree :ARG1 ( z3 country :name ( z4 name :op "United" :op "States" ) ) :ARG2 ( z5 big :topic ( z6 produce :ARG0 z3 :ARG1 ( z7 oil ) ) ) :ARG3 ( z8 most :ord ( z9 ordinal-entity :value 2 ) ) :ARG5 ( z10 world ) ) )