Only the US calls it the Gulf of America. The rest of the world did not change the name. We still call it the Gulf of Mexico.
You could call the US the land of the free. It doesn't make it that though. The issue seems to be that the people living there seem to fall for it..
Now that we're at it, it's about time that we take the term "Americans" away form the citizens of thee US. Americans should be everyone from the continent of America.