The Wall Street Journal Treasury Department Says Systems Hacked by China-Backed Actor — Several workstations and certain unclassified documents were accessed, the agency said. China’s Manufacturing Activity Expands at Slower Pace — The manufacturing purchasing managers index came in at 50.1 in December. Beijing Pushes to Use China-Made Chips in Its EVs — U.S. objects to rival’s push for self-sufficiency in $80 billion business and opens trade probe. Hong Kong Sees Flurry o