Wall Street falls again as losses wipe out all post-election gains for the S&P 500

Stocks racked up more losses on Wall Street Tuesday as a trade war between the U.S. and its key trading partners escalated, wiping out all the gains since Election Day for the S&P 500. The Trump administration imposed tariffs on imports from Canada and Mexico starting Tuesday and doubled tariffs against imports from China. All three countries announced retaliatory actions, sparking worries about a slowdown in the global economy. The S&P 500 fell 1.2%, with more than 80% of the stocks in the benchmark index closing lower. The Dow Jones Industrial Average slid 1.6%. The Nasdaq composite slipped 0.4%. The…