HONG KONG - The United States expressed concern Friday about Hong Kong's leadership change - a switch some legal experts and companies fear might mark the erosion of a legal system that has made the Chinese territory one of the best places in the world to do business. Washington avoided the blunt language it used before when it accused China of chipping away at the high degree of autonomy Hong Kong was supposed to enjoy after returning to China in 1997. Instead, U.S. Consulate General spokeswoman Susan N. Stevenson conveyed America's worry by citing the importance of the rule of...