One thing I have found interesting is that as you go more north in the US, a culture of explicit niceness becomes palpable. I have always though weather may have some relationship, as Canada by reputation would fit this view.
New Orleans residents are outliers. They are far and away the friendliest people I've met anywhere in the US, but at the same time it's a tourist economy and everyone seems to have a hustle. Much love for New Orleans.
Let's make some more generalizations.