It was invented in 1895 by a guy who thought health issues were due to nerves not trasmitting enough energy in the body, which could be fixed by his new fangled snake oil medicine.
"A subluxatrd vertebra is the cause of 95 percent of all diseases, the other 5 percent is caused by displaced joints other than those in the vertabral column"
A real quote from Daniel David Palmer, beekeeper, school teacher, grocery store owner, magnetic healing spiritualist, metaphysicist, and world’s first Chiropractor.