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One thing that may help F1 grow in the States is the ever-increasing Hispanic population. Many of them know what F1 is and have heard about Sennas and Piquets etc.

you are wrong on that point.
The burgeoning Hispanic population is not from 30-55 yr old males flowing into the country, but from american born kids and young adults of Hispanic origin.
They are actually more interested in the traditional US sports and even baseball struggles to appeal to these kids. Let alone Soccer, let alone F1. That's like saying Irish and Italian american kids love rugby and soccer respectively...they don't