The U.S. economy has a history of producing the world's most valuable companies. The first-ever $1 billion enterprise was United States Steel, which achieved the milestone 122 years ago in 1901. Since then, several different companies have topped the valuation standings; General Motors became the first $50 billion company in 1955, and General Electric won the race to $100 billion in 1995. 

But the technology sector reigns supreme today. was the first company ever to achieve a $1 trillion valuation in 2018, and it was recently worth as much as $3 trillion. But Apple has since been joined by a handful of other companies which have crossed the trillion-dollar milestone:

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Source Fool.com