Regionally (i.e. in the United States specifically "the South") it was Elvis himself (i.e. his unique singing style and performing) with the help of Sam Phillips of Sun Records.
Nationally it was Colonel Parker who became Elvis' "official manager" from 1956 until (sadly) Elvis death in 1977.
Elvis Presley. :)
Elvis Presley
Elvis Pressley
Elvis Presley
This is a no brainer. Elvis Presley is better known.
Elvis Presley is more famous
Elvis Presley is more famous than Rihanna. How many professional Rihanna impersonators do you know? Elvis has thousands.
Elvis Presley
Elvis Presley
George Washington
Elvis Presley
Tupelo is known as Elvis Presley's birthplace.