This category-leading semiconductor specialist is generating strong growth thanks to artificial intelligence (AI).Over the past 20 years, much of what fuels the U.S. economic engine has shifted. For instance, oil and industrial players were the largest publicly traded companies in the country in 2005 (measured by market cap), as ExxonMobil and General Electric were worth $392 billion and$375 billion, respectively. Now, just two decades later, the list of the most valuable companies has five stocks with mar ...