NASCAR is the most popular racing series in the United States, so why are there only 3 car brands active in the sport?

Article: https://www.msn.com/en-gb/news/other/why-are-there-only-3-car-brands-in-nascar/ar-BB1qxXAO?disableErrorRedirect=true&infiniteContentCount=0&ocid=socialshare

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