European background is not considered 'interesting' because most Americans have some.

If someone's a first generation immigrant (whether from Europe, Africa, or elsewhere, then that's considered interesting).

For example, one of the most dynamic young African-American entrepreneurs, Elon Musk, immigrated to the US.

Speaking of European Americans... I never really got if the term "Latin" in the US applies to those of Latin European descent (Spanish, French, Romanian, etc.), olny to Latin Americans (Mexican, Brazilian, etc.) or if it means something completely different??

Anyone can help me there?

You know Europe is not a country, Although Americans seam to think Africa is :)