When U.S. President Donald Trump signed orders to revive two controversial energy pipeline projects this week, he pledged to require new pipelines to use American-made steel, a gesture to workers in the hard-hit industry who helped propel him to power. But U.S. steelmakers will receive negligible benefit from the multi-billion dollar Keystone XL project, one of the two projects Trump ordered to proceed, because they have limited ability to meet the stringent materials requirements for the TransCanada line. Economists said Trump’s order has many loopholes to enforcement and could violate international trade law. Meanwhile, in the quiet prairie town of Gascoyne, North Dakota, deer wander among gleaming stacks of steel tubing intended for the Keystone pipeline. The company bought the material years ago when the U.S. debate was raging over whether the project should go ahead. TransCanada tried for more than five years to build the 1,179-mile (1,897 km) […]