I just love fairy tales.  Do you know of the earliest fairy tales?
Same here i love them and some of the earliest fairy tales contain characters such as dwarfs, dragons, and elves
Do they originate from any specific place?
The term is mainly used for stories with origins in European tradition
Is there anything special about American fairy tales?
Not much information on that but i did find that they take place once upon a time rather than actual times .  
Is that a common saying for fairy tales?
from the information i have gathered yes.  Another fact is that legends are perceived as real
Its amazing that some people are able to think of fairy tales as real.
I agree !  Another fact is colloquially a fairy story can also mean any far fetched story