The sudden ending of the "de minimis exemption" is causing chaos for international shipments. This little-known rule once let products valued under $800 enter the US without tariffs, making up a huge 92% of all freight coming into the country. Now that it's gone, international postal traffic to the US has dropped 81% in just one week, with 88 postal operators halting some US services. If you're waiting for an overseas package, this explains your delays—and why prices are about to rise sharply.