So… 2 ethnicities which speak totally different languages… ignoring the sami, the refugees, the immigrants… all of whom have their own language and culture.
Alright, how about: 87% of residents of Finland are ethnically Finnish and speak Finnish and have Finnish heritage.
Conversely, the most common USA racial group is non-Hispanic white (which groups many common languages/cultures, the most frequent of which are German/English/Polish/French). This group which is composed of all those different cultures comprises 60% of the US population.
> Compare this with USA where there is 1 language.
Nearly a quarter of American households speak a language besides English at home.
It's fine to say "there are things we can learn even though we are not as culturally homogeneous". It's fine to argue "cultural homogeneity isn't as big a deal for these things". But it's simply inconsistent with reality to claim that the USA is less ethnically and culturally diverse than Finland.
It's pretty outlandish to say that claims that America is more diverse than that are made solely in pursuit of some exceptionalism.