How did chicken sandwiches become so popular in the U.S.? Supply and demand. The emergence of large scale chicken processing companies such as Perdue and Tyson in the 1920’s and 1930’s respectively, helped propel chicken’s popularity in America. With such easy availability, chicken prices decreased, consumption increased, and chicken became a steady part of the American diet.
With many families cooking whole chickens, leftovers became standard lunch fare. Sliced leftover chicken meat became a favorite filling for sandwiches (and was the original filling for the classic club sandwich).
Fast food chicken sandwiches as we know them originated in 1967, when Truett Cathy, founder of the Atlanta based restaurant chain Chick-fil-A, introduced the chicken sandwich -- a perfectly crispy-on-the-outside, juicy-on-the-inside breaded boneless breast of chicken served on a toasted buttered bun with dill pickle chips. Whether it's fact or fiction, Cathy claimed that pickles were the only condiment he had on hand, and to his delight, were a big hit with consumers. Other fast food chains quickly followed suit. Then in the late 1980's and early '90's the grilled chicken sandwich emerged as a healthier alternative to the fried original.