Industrial stocks sink amid worries Trump's coming tariffs will start a trade war (BA, CAT, X)

The Trump administration plans to announce at least $30 billion in tariffs on China.
The Dow Jones Industrial Average sank almost 500 points on fears of a trade war.
Boeing led the spiral downward, shedding nearly 4%. 
Major industrial stocks plummeted Thursday as markets anticipated an announcement that the Trump administration will impose at least $30 billion in tariffs on China, who has vowed to retaliate. 
Near midday trading, the Dow Jones industrial average was down almost 500 po