In the United States, the sandwich usually consists of a chicken filet or patty, toppings and bread. The chicken meat can be deep fried, grilled, roasted or boiled, served hot or cold, and white or dark meat chicken can be used.
and @cendawanita@[email protected] already explained it you by way of a screenshot from another source from Wikipedia.
it's quite funny because you defeated yourself with your own logic, and when pointed to various sources you rather ignore them but choose to downvote every single comment that do not agree with you. It still won't change a damn thing that it's called a Chicken Burger outside of NA