Think of a country which had almost 780 languages, many now got extinct. Some says language/dialect all put together around 1700. Some suggest it is even higher. All I know, from the place where I am, if you travel 30 kms to South or North the accent changes, travel further, the dialects changes, travel 250 kms, language itself changes. So, think how much fun it is. By the way, official languages itself there are 22 and we do not have any one national language - India.

@JustLuAnn interestingly I frequently use the "thank you kindly" but shudder / horror never the "come back..." part.
When talking with a male acquaintance who you have some respect for they are frequently called by the vernacular for a vagina as in "pass me another tinnie ya useless c#nt". The term is still used disparagingly against both men and women "that c#nt Sheriff Bodine gave me another speeding ticket on highway 47!"
Where I came from thanks was expressed to female bar staff, waitresses, bus conductors and shop assistants with "thanks luv".
In Queensland a suitcase was called a "port" which I had no problem with as I remembered a few words in French.

The first 25 years of my life I lived in Buffalo New York. When I moved to Florida the accent folks had was evident- similarly southern, albeit maybe a bit softer. Since living in Florida for the past 26 years, anytime I go back to my hometown to visit, I can totally hear the difference in accents with a's and ou's, and in the wording/phrases. It never ceases to amaze me.

Having grown up in south Georgia and north Florida,. I grew up with all of the southern expressions. I particularly liked the colorful -- and often profane -- but very expressive sayings like "as useless as the tits on a boar hog or "it come a toad-strangler" (heavy rain)."

How's ya mamma an'em?

"You want a Coke?"

"Sure!"

"What kind?"

"..."

"We got Co-Cola, Mountain Dew, root beer..."

"Um... I'll take a Coke."

"But what kind you want?"