New Year, new bloodbath: Stocks plunge after weak data from China

US index futures are tumbling, following global stocks lower after manufacturing data out of China signalled a slowdown.
The S&P 500 was down 6.2% in 2018, booking its worst year since the financial crisis and worst December since the Great Depression. 
Read more at Markets Insider.US stocks look set to tumble after soft data from China cast a somber mood on global markets on the first trading day of the New Year.  
In China, the Caixin/Markit Manufacturing Purchasing Managers' Ind