The three major benchmarks struggled in the first months of the year as investors worried about the economic situation ahead. President Donald Trump set out a plan to impose tariffs on imports, a move analysts and economists said could weigh on growth. The concern is both businesses and consumers would face higher costs -- a scenario that might hurt corporate earnings. Over the past few weeks, though, certain positive elements have helped the S&P 500 (^GSPC 0.41%), the Dow Jones Industrial Average (^DJI 0.0 ...