About 1.7 million barrels per day of what the US imports (a net of 9.7 million b.p.d. in 2009, according to the Energy Information Administration) comes from the Persian Gulf, mostly from Saudi Arabia, which supplies about 1 million b.p.d. Kuwait supplies about 182,000 b.p.d. In North Africa, Algeria supplies about 493,000 b.p.d.
The nations involved in the upheaval, however, supplied very little to the US. Tunisia, for instance, supplied about 260,000 barrels in all of last year. Libya supplied next to nothing to the US directly, according to the US Department of Energy, although it supplies about 2 percent of the world’s needs overall. So instability there has a ripple effect on the US and Europe, which buys a lot of Libyan oil.