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The Trans-Pacific Shipping Lanes
The great-circle sea lanes between East Asia and North America, barometer of U.S.–China trade and tariffs
When economists want to know how American shoppers and Chinese factories are getting along, they watch the container ships crossing the North Pacific. The trans-Pacific lanes link the ports of China, South Korea, Japan, Taiwan, and Southeast Asia with the West Coast of North America, and through the Panama Canal with the East and Gulf coasts. Along with Asia–Europe, this is one of the two largest container trades in the world, and it is lopsided: ships sail east full of furniture, electronics, and toys and often return with grain, scrap, paper, and empty boxes. Because it carries so much of the U.S. trade with China, it has become the front line of every tariff fight since 2018.
Ships between Shanghai and Los Angeles follow a great-circle course that bends north toward the Aleutian Islands rather than a straight line on a flat map, covering about 10,500 kilometers in roughly 12 to 16 days. The main North American gateways are the twin ports of Los Angeles and Long Beach on San Pedro Bay, along with Oakland, Seattle and Tacoma, and Vancouver and Prince Rupert in Canada, from which rail lines carry boxes inland. Cargo for New York, Savannah, or Houston either moves across the continent by train or stays at sea through the Panama Canal, a voyage of about a month. The open Pacific has few chokepoints, but feeder routes from Southeast Asia pass the Taiwan Strait and the South China Sea.
The first regular trans-Pacific trade was the Spanish Manila galleon, which from 1565 to 1815 carried Mexican and Peruvian silver to Manila to buy Chinese silk and porcelain. Containerization and China's rise turned the lanes into a superhighway after 1980. U.S. tariffs in 2025 swung volumes up and down as importers rushed goods in ahead of each deadline, and Descartes counted 28.08 million TEU of U.S. container imports for the year, down 0.4 percent. In February 2026 the Supreme Court struck down tariffs imposed under emergency powers. A temporary 10 percent global tariff followed, then from July 24, 2026, new Section 301 duties of 10 to 12.5 percent on 60 economies. U.S. imports hit a September record of 2.55 million TEU in 2026, up 10.3 percent, with shipments from China up 21.2 percent.