I'm not sure, maybe somebody decided that USA gives the most freedoms than any other country?
It seems a bit contradictory when you think about it.
Why would a free world need a leader? Leaders exist to say what we can and can't do, and if it were a free world, we can do whatever we want.
Yes, this is probably some patriotic nickname that stuck. I think it is also used for dramatic effect in movies and TV.


