Early in its history, Seymour was a thriving Native American fishing community along the banks and falls of the Naugatuck River. As European settlers arrived, agriculture dominated the landscape. During the early days of the Industrial Revolution, Seymour flourished as a manufacturing community, and its products were in demand throughout the world. The first woolen mill in the United States was established at the falls by Gen. David Humphreys, who was aide-de-camp to Gen. George Washington. It has been said that his mill produced some of the finest wool in the entire country. The Kerite Company remains the longest-standing manufacturer in Seymour, producing electrical cable used in oil drilling and other areas. Today Seymour is one of the seven towns that make up the All American Valley.