Back in the 1960's in the USA, GM had about 55% market share, Ford had about half at 28, and Chrysler had half that at around 14, with AMC making up the rest. Japanese weren't yet in the mix. I wonder what GM, Ford and Stellantis (which is really not USA-based but we'll include them anyway) would say if they were to be guaranteed those percentages today in the USA if all non-USA-based mfrs. like Toyota and Hyundai et al were banned from selling cars in the USA. And USA Ford, GM and the Mopar brands could not be sold outside the USA. I'm not going to research and do the math. If someone wants to, be my guest. But I'll give you a starting point. USA unit sales for 2025 was around 16 million. GM had 17% market share which is 2.7 million units. If they had 55% market share that would be 8.8 million units. I don't know the global numbers. So what do you think?