In a departure from convention, Chinese leader Xi Jinping sent a congratulatory message to the United States on Independence Day. “This year marks the 250th anniversary of the independence of the United States. President Xi Jinping, on behalf of the Chinese government and the Chinese people, has already sent a congratulatory message to US President Trump,” Chinese foreign ministry spokeswoman Mao Ning said in Beijing on Monday. Beijing does not usually publicise presidential greetings on July 4...