The first half of the year was a turbulent one for stocks in general amid concern President Trump's planned import tariffs would hurt the economy. And this problem weighed most heavily on stocks that depend on growth and investment -- such as those in the field of artificial intelligence (AI). These particular players led indexes higher over the past two years on optimism about spending and the technology's potential, but they lost momentum in March and April. Since, though, the U.S. has made progress on tr ...