WASHINGTON : Taiwan Semiconductor Manufacturing Co has begun producing advanced 4-nanometer chips for U.S. customers in Arizona, Commerce Secretary Gina Raimondo told Reuters, a milestone in the Biden administration's semiconductor efforts. In November, Commerce finalized a $6.6 billion grant TSMC's U.S. unit for semiconductor production in Phoenix, Arizona. "For the first time ever in our country's history, we are making leading edge four-nanometer chips on American soil, American workers - on