The US imposed a 25% tariff on imports of certain semiconductors, a key step in an agreement blessed by President Donald Trump allowing Nvidia Corp. to ship Taiwan-made H200 artificial intelligence processors to China.Under an order Trump signed on Wednesday, the government would collect the duty on the chips as they’re brought to the US before final shipment to Chinese customers and other foreign markets. Nvidia relies on Taiwan Semiconductor Manufacturing Co. to produce the chips it designs, i...