What's obscure about it?
Because of the Langley-Curtis shenanigans, the Smithsonian, to get the Flyer, had to essentially agree to a "gag order" relating to other claimants to first flight, and US educational institutions have followed suit.
Hence, Alberto Santos-Dumont, who holds the FAI record (meaning he did it in Paris in front of judges) for first powered controlled heavier-than-air flight is virtually never mentioned in the USA. In Brazil he's a national hero.
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