By the 1870s and 1880s, cattle ranches expanded further north into new grazing grounds and replaced the bison herds in Wyoming, Montana, Colorado, Nebraska, and the Dakota territory, using the rails to ship to both coasts. Many of the largest ranches were owned by Scottish and English financiers. The single largest cattle ranch in the entire West was owned by American John W. Iliff, "cattle king of the Plains", operating in Colorado and Wyoming. Gradually, longhorns were replaced by the British breeds of Hereford and Angus, introduced by settlers from the Northwest. Though less hardy and more disease-prone, these breeds produced better-tasting beef and matured faster.