Taiwan Semiconductor Manufacturing Company (TSMC), the world's top semiconductor manufacturer, has pledged to invest another $100 billion over the next four years to boost advanced semiconductor manufacturing in the United States.

TSMC's investment will total $165 billion at full buildout with six fabs, two advanced packaging facilities and a research and development center. That's the largest investment in Arizona's history and the largest foreign direct investment in the U.S. "It's incredible isn't it?" Mackay said.

Taiwanese chip-making giant TSMC plans to invest a whopping $100 billion in the United States, after US President Donald Trump threatened to slap tariffs on overseas-made chips.

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TSMC's plans to invest billions more in Arizona to expand its semiconductor factories has caught the attention of three other major computer chip companies.

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