Final answer:
California passed the Chiropractic Initiative Act in 1922, establishing regulations for the practice of chiropractic and creating a Board of Chiropractic Examiners.
Step-by-step explanation:
The year California passed the Chiropractic Initiative Act (CIA), licensing chiropractic, was 1922. This act regulated the practice of chiropractic in the state and established the Board of Chiropractic Examiners to oversee the profession. It was a significant advancement for the chiropractic profession, ensuring that practitioners met certain standards of education and practice before they could legally offer their services to the public.