Several comments have ressurected old wisdoms I learned from others more knowledgeable.
Range in front of the hunter caused different breeds to develop. Tall brush and hunting style caused breeders to choose for different traits.
Roughly in order, from close hunting to ranging, this was the norm. Brittany, English Springer, Gordan setter, English setter, Irish setter, GSP, English pointer. Cockers were in there somewhere, but they haven't been in the wild since Napoleon. Vizlas and Weimaraners were more large game but did cross over.