Shorthorns were first brought to America in the late 1700s, with the largest number of cattle arriving after 1820. The breed was initially concentrated in Ohio and Kentucky, a region rich in grass and corn to feed cattle, but by the end of the 1800s it had spread throughout America. The Shorthorn was valued for its dairy and beef qualities and was also used as a draft animal.
Early in the 1900s, the breed was formally split into a beef type, called Beef Shorthorn or simply Shorthorn, and a dairy type called Milking Shorthorn-Native, now known as the Heritage Shorthorn. Most breeders favored selection for beef, and this trend has continued, especially with the rise of the Holstein as the dominant dairy breed.

copied from Livestock Conservancy (2020)

https://livestockconservancy.org/heritage-breeds/heritage-breeds-list/heritage-shorthorn-native-milking-cattle/