Where was the Chester White breed developed?

The Chester White breed of swine was developed in Pennsylvania. This breed is recognized for its distinctive white color, droopy ears, and sturdy build, which are traits that have been selected over generations to enhance their suitability for both meat production and adaptability to various farming conditions. The breed's development in Pennsylvania reflects the region's significant contributions to American agriculture, particularly in livestock breeding. The focus on creating a breed that excelled in both growth rate and maternal capabilities has solidified the Chester White's reputation and utility in the swine industry. This historical context and the importance of Pennsylvania in the development of the Chester White breed clarify why it is the correct answer.