U.S. Army management of Yellowstone was so successful that by 1891 they were also managing Sequoia, Yosemite and Kings Canyon National Parks in California and Mackinac National Park in Michigan. The National Park Service later followed the precedents established by the army and incorporated them into their own management strategy. During its tenure at Yellowstone, the army developed regulations that put emphasis on protection of park resources, safety of visitors, and positive but effective visitor interaction. Under the watchful eyes of the army, the geothermal features, forests and wildlife of Yellowstone were protected from vandalism, fire and poaching. These practices were adopted by the National Park Service and continue as a foundation of National Park management policy. Proactive actions by the army in stopping poaching in the park led to the passing of the Lacey Act of 1894, which established legal protection for the wildlife and remedies for dealing with violators.