USL launched its first service in the Transpacific in late 2003, offering a fixed-day, weekly schedule to Long Beach from two of Asia's largest loadports, Yantian and Hong Kong. In the spring of 2005, USL extended its scope to include Vietnam, offering service between Hong Kong and Ho Chi Minh City, with transhipment to California over its Hong Kong hub.
In December of 2007, USL was purchased by the CMA CGM Group to operate as a subsidiary of Australia National Line (ANL).