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Accents are not region bound, although in some cases yes. Accents are mainly nation bound! If you want to go against the dictionary definition, make your own!
What? You say they aren't region bound, then you say "although in some cases yes". That would mean that some accents are region bound, which is all I'm saying.
So by your logic, everyone in the entire nation of the United States of America speaks the exact same way? There is no southern, midwestern, Boston, or New York accent? Do you really think that people from California speak like everyone from the movie Fargo? Have you ever been outside of northern Europe? Every single region of Italy has a different accent, as well as Spain, France, Germany, Austria, and almost every other country on the face of the planet big enough to have different regions. In Brazil they speak Portugese but it's not exactly the same as in Portugal. They have a different accent AND different dialect as well.
Are you basing your entire argument over one single line in the dictionary? This isn't rocket science, man. This is common sense. Different regions have different customs and that includes different ways of speaking the same language. As you pointed out earlier, in some extreme cases such as Italy, the dialects can also be radically different,
but this isn't the case for everyone. Accents are no exception. Speak with someone from Madrid and then speak with someone from Barcelona and you'll see that the accent is different. Speak with someone from Paris and then speak with someone from Nice and you'll hear a different accent. Speak with someone from Rome and speak with someone from Milan and you'll hear a different accent.
Where's the disconnect here? Why is this such a debate?