[oh_sigh]

Number of language spoken is largely a function of the environment and doesn't have much to do with intelligence. If you take a highly multilingual African and drop them in America, in two generations you will likely have mostly monolingual descendants.

[throwaway468883]

Not confirmed by current immigrants.

https://en.wikipedia.org/wiki/African_immigration_to_the_Uni...

[oh_sigh]

You'd have to link to something more specific than "African immigration to the US" to make your point.