The Keystone XL pipeline will play an important role in America’s position as an ongoing fuel producer and exporter. Rather than counting on tankers crossing the ocean with crude, it will bring domestic and friendly foreign oil to refiners along the Gulf Coast. Many refiners are located on the coast because the tankers coming from the Middle East dock there. The crude oil is then unloaded and refined. Once refined, the fuel, as always, gets distributed throughout the US, but is now also sold and shipped to countries worldwide. An available and abundant fuel supply drops the price, and all sectors of the US economy benefit.
Please read the following article