Silicon Valley relies on foreign talent to compete in the global AI race. Some tech leaders say that's a national security risk.

Big Tech refers to the largest and most influential technology companies, often including Apple, Microsoft, Amazon, Alphabet, and Meta, which dominate global markets and innovation.

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Big Tech, once the market leader, is being overshadowed by gains from the new stars of the artificial intelligence boom: semiconductor chipmakers. Shares in semiconductor companies such as Intel (INTC ...

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