Taiwan Semiconductor Manufacturing Company makes 24% of all the world’s chips, and 92% of the most advanced ones found in today’s iPhones, fighter jets and supercomputers. Now TSMC is building America’s first 5-nanometer fabrication plant, hoping to reverse a decades-long trend of the U.S. losing chip manufacturing to Asia. CNBC got an exclusive tour of the $12 billion fab that will start production in 2024.