this is SPARTA!!!

so why were the spartans part southern? i mean what was with that dialect and why was it chosen? Lampito and the other spartans sounded plumb crazy when they wasa talkin' and gettin' on and stuff. it was just hard for me to imagine these characters as spartans or athenians when they talked like that. it was a funny scence in my head. it would be all these women in greek wear and then there would be a woman in a ten gallon hat and a cowboy shirt with chaps and a lasoo hanging out with them. that's just what i imagined when any spartan was around. the spartans dialect was very different from any of the other characters and i think it would be interesting to know if this is how they really talked way back when. i mean i doubt aristophanes knew that some where years in the future people in the rural southern united states would speak like this. where did this dialect come from?