When the Industrial Revolution reached Western Massachusetts in the 19th century, the region's many fast-moving rivers resulted in a mill town boom. Early textile and paper mills were staffed by Irish famine immigrants who nearly doubled their population in the town between 1840 and 1860. Paper manufacturing became a major regional industry, including within the town limits included (mostly clustered on the Agawam River) the Southworth Paper Company (1839), the Agawam Paper Company (1859), the Agawam Canal Company, the Springfield Glazed Paper Company (1882), the Worthy Paper Company (1892), the Mittineague Paper Company (1892, later known as the Strathmore Paper Company and acquired by International Paper)