If the United States buys so little oil from the Persian Gulf, why would a war in the region cause gas prices here to spike?

The price of oil seesawed in trading in response to U.S. President Donald Trump's imminent threat to obliterate Iranian power plants and bridges.

If the United States buys so little oil from the Persian Gulf, why would a war in the region cause gas prices here to spike?

Gasoline prices surged by 21.2% between February and March – the largest monthly increase since the the government began publishing a gasoline price index in 1967.

Government report shows gasoline going up by 21.2 percent in March as petrol remains above $4 per gallon despite truce.