Final answer:
George McAndrews contributed to the field of chiropractic by serving as the lead attorney in the Wilk v. American Medical Association case, a landmark lawsuit that culminated in a significant victory for chiropractors in 1987.
Step-by-step explanation:
George McAndrews' major contribution to chiropractic was that he argued for the chiropractors in the Wilk case. Specifically, he played a pivotal role as the lead attorney in the antitrust suit Wilk v. American Medical Association. This lawsuit accused the American Medical Association of conspiring to contain and eliminate the chiropractic profession. McAndrews' efforts ultimately led to a victory for the chiropractic profession in 1987, affirming their legitimacy as healthcare providers. George McAndrews contributed to the field of chiropractic by serving as the lead attorney in the Wilk v. American Medical Association case, a landmark lawsuit that culminated in a significant victory for chiropractors in 1987.