The U.S. economy has evolved over time. The industries that created the most value last century -- steel and automaking -- are not the ones leading the way today. The leaders now come from the technology sector. 

The first public company to amass a $1 trillion valuation was Apple in 2018. Its market capitalization has since grown to over $3 trillion. Meanwhile, four other companies have now also crossed the exclusive $1 trillion mark: , Amazon, Nvidia, and Google parent Alphabet.

There's a significant evolution happening within the tech sector itself right now (it's been integral to boosting the market cap of the companies mentioned above). It involves artificial intelligence (AI), which is powering a huge shift to automation and boosting productivity across the corporate world.

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Source Fool.com