Walter Montego: I never made the connection until right now that it might be in part because of movies. Is it not something to wonder why so many of the movies in the world that are worldwide known are made in the United States?

Movies, TV shows, etc... Here in Portugal, most of the programs that are shown on TV or in the cinema are subtitled. In Brasil and Spain, for instance they are dubbed. I've always thought that it could be a very strong reason to the fact that, overall, the portuguese have a better understanding and accent of the english language than some other people do - you get to listen it everytime on tv and cinema and you end up making connections from certain words or expressions from what is written in the subtitles to what the actors say.
That's also why, most people will feel more familiar with the american accent rather than the british one - most of the stuff that shows up on TV that comes from abroad, comes from the USA.