source: the Persian Gulf countries need to sell oil more than the United States needs to buy it. # Thus, most states, whether their governments are friendly to the United States or not, have a huge incentive to export oil into the world market.
target: the Persian Gulf countries need to sell oil more than the United States needs to buy it. And since Selling oil to U.S. is the best means to fulfil the need to sell oil. Thus, most states, whether their governments are friendly to the United States or not, have a huge incentive to export oil into the world market.