In what year did D.D. Palmer establish his foundational theories of chiropractic?

The foundation of chiropractic was established in 1895 when D.D. Palmer conducted the first chiropractic adjustment. This year marks a pivotal moment in the development of chiropractic theory, as Palmer's work laid the groundwork for what would evolve into a distinct form of healthcare focused on the relationship between the body’s structure—primarily the spine—and its function.

In that year, Palmer articulated the initial principles that would shape chiropractic philosophy, introducing concepts such as the vertebral subluxation and the body's innate ability to heal itself without the use of drugs or surgery. This foundational event led to the establishment of chiropractic as a recognized practice, which has continued to grow and develop since then.

The other years listed, while they may be significant in their own right, do not represent the initial establishment of chiropractic principles as 1895 does. Therefore, pinpointing that year is crucial for understanding the origins and evolution of chiropractic philosophy.