Pretty much yes, they'd get washed away.
I think another thing is the maintenance factor. I Think a lot of US tracks are hobby shop owned or commercial in some way. Looking after the clay takes time and money, they spray it, roll it, etc etc.
There is 3A down south, but when we had the national there, the rules dont allow for clay tracks to be maintained (watered) so it got a bit dusty, which I dont think would happen at some of the tracks in the usa - some of them even water the tracks between each race as far as I know.
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