U.S. stocks closed: the three major Indexes closed mixed, with tariff threats causing severe market fluctuations.

① Conservative media stocks in the USA surged over 700% on their debut; ② The Nasdaq Golden Dragon China Index fell 0.61%, with a cumulative decline of 0.08% in March; ③ News of a merger between the chip foundry giants GlobalFoundries and United Microelectronics has emerged; ④ Amazon launched the AI agent Nova Act.

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