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A Hyundai container ship sits docked in this aerial photograph taken above the Port of Los Angeles in Los Angeles, California, U.S., on Wednesday, Feb. 18, 2015. United Steelworkers members who help run crude terminals at a California port are threatening to join a national oil workers' strike at U.S. refineries. Photographer: Patrick T. Fallon/Bloomberg via Getty Images

A Hyundai container ship sits docked in this aerial photograph taken above the Port of Los Angeles in Los Angeles, California, U.S., on Wednesday, Feb. 18, 2015. United Steelworkers members who help run crude terminals at a California port are threatening to join a national oil workers' strike at U.S. refineries. Photographer: Patrick T. Fallon/Bloomberg via Getty Images