Is it because of murica or there is more to it
No. It is because of Great Britain. They were ahead of the pack being the first industrialized empire. During their empire rampage, ie, colonizing America, they by accident....created a colony of their own kind, English men & women in America who wanted to be free.
So basically, u r right, America is responsible. Because it is the greatest free country in the world. Even tho America borrowed the English language from its mother land United Kingdom, it is the leader of the world.