On August 25, 1972, U.S. President Richard Nixon signed legislation authorizing the establishment of the Grant-Kohrs Ranch National Historic Site in Deer Lodge, Montana. This act preserved one of the most significant 19th-century cattle ranches in the American West, recognizing its pivotal role in the development of the open-range cattle industry.

The ranch, founded by Johnny Grant and later expanded by Conrad Kohrs, became known as the "Home of the Montana Cowboy" and played a crucial role in shaping the cattle industry from the 1860s to the early 20th century. The historic site now serves as a living museum, offering visitors a glimpse into the daily life and operations of a working cattle ranch during its heyday.

It preserves original buildings, equipment, and livestock, providing educational programs that interpret the history of ranching, westward expansion, and the cultural heritage of the American cowboy. The site is a vital resource for understanding Montana's agricultural past and its enduring legacy.