The president’s steep tariffs and erratic moves have turned manufacturing abroad into a minefield, even for entrepreneurs who set up in countries viewed as safe alternatives to China.

The end of the “de minimis” exemption — which allowed packages less than $800 to enter the U.S. tariff-free — is leading to confusion.

The end of the “de minimis” exemption — which allowed packages less than $800 to enter the U.S. tariff-free — is leading to confusion.

© DeSean McClinton-Holland for The New York Times

The Trump administration levied a hefty tariff on goods that are moved through other countries, but it has not yet fully explained its plans.

The experience of a company in the textile business illustrates how the trade war could force some industries to shift production out of the United States.