regional Variations of English in the US.

west

California vowel shift

"king" sounds like "keeng"

"cot/caught merger"

Subtopic

South

use of ya'll

instead of "you" when addressing a group.

Subtopic

pin/penmerger

"e" in pen sounds like "I" in pin

monopthongiztion of ai to A

"dime" sounds like "daim"

New England

non-rhoticity

dropping the "R" in words that end in R

"Car" sounds like "CaH"

midland

northern cities shift

"Ann sounds like "IAN"