This historically low-tech business is getting a digital upgrade.In 2018, tech giant Apple became the first U.S. company to reach a market capitalization of $1 trillion. Since then, it's been joined by other companies such as Microsoft, Amazon, Alphabet, Meta Platforms, and Tesla. Of course, the list also includes the current market-cap leader, Nvidia.It's becoming increasingly normal for a new company to join the $1 trillion club. But it remains an impressive feat nevertheless. At this pace, these tech tit ...