I think the only reason English is considered International language... well... nobody said it is... just that a lot of people like to think about it that way.
As I was saying the only reason it is so wide spread is because it is SOOOOO simple. I´d say language for dumb.
Only Esperanto is easier to learn. 




I don´t mean it as an insult, it´s just simple that´s all. No verb conjugation - only sufixes. No conjuagtion of nouns or adjectives. Nouns are not devided into several genders... and I could go on and on. 
And this are only adjectives... don´t even get me started on nouns or verbs... 



