There are like 500,000 words in the language, ( a million if you include scientific words) vs. like 100,000 in Spanish.
My numbers may be off, BTW.
A fairly well educated American knows like 20,000 words of 500,000 +.
So you know 4% of the words in English, and you're fluent ?
I'd hate to try to learn this language, if I just escaped Mexico !
I'd sure have a hard time learning another language, I don't remember much of the French I took in HS, learned a bit of Spanish in my time around Calif, Nev, Colo.
I sure couldn't learn that chinese/jap stuff , ain't no way !