English is, without question THE GLOBAL LANGUAGE.
...and for a very good reason...
I studied Polish for god-only-knows how long and I still don't like it and can't understand as well as I do American.
I studied Latin for 4 years and Russian for 7 and I would die from starvation in ancient Rome and Moscow.
I didn't spend one hour studying English and now it's my primary language.
English is like sex; you instantly know how to do it. The best example is Paulina. I am talking about her perfect English, not her love life.