How did they form? What are their specific traits? Stereotypes (even untrue, if marked as such)?
If cultural differences coincide with geography, please mention in, too.
In the questions about weird things people from different continents do somebody pointed out, that Europeans have little knowledge of this, so please fix my ignorance.
I’ve found DC to be the rudest bunch of people I’ve ever met. Everywhere I’ve gone in DC the people are just totally rude assholes. Everywhere I’ve been in the south has just been nice, polite, helpful people.