Two decades ago, factories in Indiana that turned rare earth metals into magnets moved production to China " just as demand for the magnets was starting to soar for everything from cars and semiconductors to fighter jets and robots.
The United States is now reckoning with the cost of losing that supply chain. The Chinese government abruptly halted exports of rare earth magnets to any country on April 4 as part of its trade war with the United States.
American automakers are the hardest hit, with executives warning that production at factories across the Midwest and South could be cut back in the coming days and weeks. Carmakers need the magnets for the electric motors that run brakes, steering and fuel injectors. The motors in a single luxury car seat, for example, use as many as 12 magnets.