US seaports handled the equivalent of 451,000 40-foot containers of goods from China in December, a year-over-year increase of 14.5%.

The migration of manufacturing to Mexico could undermine Trump’s promise to voters that ratcheting up tariffs on China would incentivize companies to bring production back to the U.S and give American companies a more even playing field.

China’s exports in December grew at a faster pace than expected, as factories rushed to fill orders to beat higher tariffs that U.S. President-elect Donald Trump has threatened to impose once he takes