Odds and Ends
19 6, 4:12am
By "white girl" I think you mean the San Fernando accent, the famous "Valley Girl Accent". Which is basically the stereotypes of Californians (especially southern California) in general. See Also: Surfer dude accent.
The way humon draws Sister America she's super Californian. Combine the vapid SoCal stereotypes with the trendy hipster NoCal stereotypes. And being more left wing than Brother America.
Brother America I guess is like the Midwest/South or something. But yeah frat bro works.