It was last December when US President Joe Biden stood at a groundbreaking ceremony for a chip fabrication facility being built in Phoenix, Arizona, by the world's largest chip maker, Taiwan Semiconductor Manufacturing Co, and described American union workers as "the single greatest technicians in the world". "American manufacturing is back", Biden declared. "The reason why business should be hiring union folks, if you don't mind my saying, is simple: They're the best in the world." His remarks