Where is America First in all this?
You need to get up to speed. Crude has been flowing to the Gulf for a number of years now. XL is just a branch that will pick up US crude from the Bakkens to get it to market.
The Bakkens already have a market for their crude, they ship it east or west, whatever refinery has the best price for them when they buy it....and it serves the need on both coasts....shipping it all the way down to Texas via a pipeline to be refined down there, only for it to be shipped back up to their region for its use is a wasted action.