Rivian appears to have used the Tesla Manufacturing process as a template for creating their own business

 My cousin owns a Tesla Model S which he showed me how it goes up to 120 mph in a few seconds because there are no gears it's just bzzzz zero to 120 in a few seconds. He also showed me the self driving aspects of his car too where it will automatically keep the car in the same lane at a certain distance behind any vehicle in front of him too.

Then he told me about taking a tour through the Tesla Factory here in California which is in Fremont in the SF Bay area where silicon Valley is too. This would be very convenient to have one of the most advanced electric car building facilities in the world there because of Silicon Valley nearby. There are very very few employees because mostly it is robots building Teslas there. 

I was watching a Video of the Rivian Factory and it looked pretty much exactly like the Tesla Factory in Fremont where they build Teslas.

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With headquarters in Irvine, California, Rivian has 2,960 employees working at its sole production facility, a converted Mitsubishi plant in Normal, a rural college town about 130 miles south of Chicago, and 8,000 employees overall.Sep 15, 2021

EV truck startup Rivian launches production in Normal

Also, there are more electric Cars and trucks as well as hybrids in California than anywhere 

else on earth. Part of the reason is there are charging stations throughout California

so people can recharge as they travel. It's possible to go from San Diego to Seattle with Charging

stations every step of your way now.